An aluminum-plastic film welding device and a method for welding aluminum-plastic film.

Abstract

This application relates to the field of aluminum-plastic film welding technology, and particularly to an aluminum-plastic film welding apparatus and method. The aluminum-plastic film welding apparatus includes a clamping fixture for holding the aluminum-plastic film, a laser welding system for laser welding the clamped aluminum-plastic film, a cooling system connected to the clamping fixture for cooling the aluminum-plastic film, a temperature measuring system mounted on the laser welding system for detecting the temperature of the weld zone of the aluminum-plastic film, and an integrated control system communicatively connected to the laser welding system, the clamping fixture, the cooling system, and the temperature measuring system. The temperature measuring system feeds back the temperature of the weld zone of the aluminum-plastic film to the integrated control system, which then controls the laser welding system and / or the cooling system based on the weld zone temperature to keep the temperature of the weld zone within a preset temperature range, thereby improving the welding quality and sealing performance of the aluminum-plastic film.

Description

Technical Field

[0001] This application relates to the field of aluminum-plastic film welding technology, and in particular to an aluminum-plastic film welding device and an aluminum-plastic film welding method. Background Technology

[0002] During the laser welding process of aluminum-plastic film, the high laser energy and poor temperature control of the weld seam often cause damage to the aluminum-plastic film. When the aluminum-plastic film is damaged, its sealing performance is affected, making the weld joint a weak point for electrolyte leakage in highly corrosive environments such as those used in pouch batteries. In severe cases, this can pose a safety hazard. Summary of the Invention

[0003] To address the aforementioned technical problems, this application provides an aluminum-plastic film welding device, comprising a clamping fixture for clamping the aluminum-plastic film; a laser welding system for laser welding the clamped aluminum-plastic film; a cooling system connected to the clamping fixture for cooling the aluminum-plastic film; a temperature measuring system mounted on the laser welding system for detecting the temperature of the weld zone of the aluminum-plastic film; and an integrated control system communicatively connected to the displacement driving system, the laser welding system, the clamping fixture, the cooling system, and the temperature measuring system. The temperature measuring system monitors the temperature of the weld zone of the aluminum-plastic film in real time and feeds the detected temperature back to the integrated control system. The integrated control system then controls the laser welding system and / or the cooling system based on the weld zone temperature of the aluminum-plastic film, thereby improving the controllability of the weld zone temperature during laser welding. In this way, not only can the weld pool in the weld area of ​​the aluminum-plastic film be avoided from being damaged by the high temperature during the laser welding process, thus affecting the sealing performance of the aluminum-plastic film, but it can also prevent the weld from being too tight due to the low temperature in the weld area during the laser welding process, thus affecting the sealing performance of the aluminum-plastic film.

[0004] Preferably, the clamping fixture includes an upper clamping plate, a lower clamping plate for supporting the aluminum-plastic film, and a clamping drive assembly for driving the lower clamping plate to move toward the upper clamping plate. The lower clamping plate is connected to the cooling system. The clamping drive assembly drives the lower clamping plate to move toward the upper clamping plate, thereby clamping and fixing the aluminum-plastic film by the cooperation of the lower and upper clamping plates. This ensures that when welding the aluminum-plastic film through the upper clamping plate in subsequent welding processes, the aluminum-plastic film will not shift in position, thus improving welding accuracy and the sealing performance of the aluminum-plastic film.

[0005] Preferably, the lower clamping plate has at least two flow channels inside, and the cooling system includes cold water pipes connected to each of the flow channels, and electronic regulating valves for adjusting the flow rate of the cold water pipes. During the micro-interface welding process of the aluminum-plastic film, the flow rate and volume of the coolant can be controlled by the electronic regulating valves to regulate the temperature of the weld zone of the aluminum-plastic film. This ensures that the weld zone of the aluminum-plastic film is at an optimal temperature during welding, avoiding the problems of molten pool formation at high temperatures causing damage to the aluminum-plastic film, and insufficient weld tightness and easy detachment at low temperatures, thereby improving the welding quality of the aluminum-plastic film.

[0006] Preferably, the clamping drive assembly is connected to the lower clamping plate via a pressure detection assembly. The pressure detection assembly can feed back the pressure value to the integrated control system, which in turn adjusts the clamping pressure of the clamping fixture to prevent the aluminum-plastic film from shifting during welding, thereby improving the sealing performance of the aluminum-plastic film micro-interface welding and increasing the yield.

[0007] The aluminum-plastic film welding device also includes a displacement driving system, which is used to drive the laser welding system to move so as to move the temperature measuring system, so that the temperature acquisition area of ​​the temperature measuring system is located in the weld seam area of ​​the aluminum-plastic film.

[0008] On the other hand, this application provides an aluminum-plastic film welding method, applied to an aluminum-plastic film welding apparatus, the aluminum-plastic film welding method comprising the following steps:

[0009] S1: Obtain the temperature of the weld zone of the aluminum-plastic film detected by the temperature measurement system;

[0010] S2: If the temperature of the weld zone exceeds the preset temperature range, the laser welding parameters of the laser welding system and / or the cooling parameters of the cooling system shall be adjusted so that the temperature of the weld zone of the aluminum-plastic film is within the preset temperature range.

[0011] The preset temperature range is the temperature range within which the heat-sealing layers of the aluminum-plastic film are sealed together during laser welding of the aluminum-plastic film.

[0012] Preferably, the cooling system introduces coolant into the clamping fixture, and the aluminum-plastic film on the clamping fixture is cooled by the flow of coolant. The cooling parameters include the coolant flow rate, and the laser welding parameters include the laser emission power.

[0013] In step S2, adjusting the laser welding parameters of the laser welding system and / or the cooling parameters of the cooling system to ensure that the temperature of the weld zone of the aluminum-plastic film is within the preset temperature range includes:

[0014] If the temperature of the weld zone is less than the preset temperature range, then the laser emission power of the laser welding system is increased to the first power range;

[0015] If the temperature of the weld zone is greater than the preset temperature range and the temperature of the weld zone is within the first temperature range, then the laser emission power of the laser welding system is increased to the second power range, the cooling system is turned on, and the coolant flow rate of the cooling system is adjusted to the first speed range.

[0016] If the temperature of the weld zone is greater than the preset temperature range and the temperature of the weld zone is within the second temperature range, then the laser emission power of the laser welding system is reduced to the third power range, and the coolant flow rate of the cooling system is increased to the second speed range.

[0017] Wherein, the preset temperature range is smaller than the first temperature range, the first temperature range is smaller than the second temperature range, the first power range is smaller than the second power range, the third power range is smaller than the first power range, and the first speed range is smaller than the second speed range.

[0018] Preferably, the aluminum-plastic film welding device further includes a displacement driving system, which drives the laser welding system to move in order to move the temperature measuring system; before step S1, the method further includes:

[0019] The displacement driving system is controlled to drive the laser welding system to move its position so that the temperature acquisition area of ​​the temperature measuring system is located in the weld seam area of ​​the aluminum-plastic film.

[0020] Preferably, the step of controlling the displacement driving system to drive the laser welding system to move its position so that the temperature acquisition area of ​​the temperature measuring system is located in the weld area of ​​the aluminum-plastic film includes:

[0021] Acquire the first beam guiding spot of the laser welding system and the second beam guiding spot of the temperature measuring system;

[0022] Obtain the beam distance between the first beam guiding spot and the second beam guiding spot;

[0023] The displacement driving system is controlled according to the spot distance to drive the laser welding driving system, so that the temperature acquisition area of ​​the temperature measuring system is located within a preset distance range behind the focal point of the laser welding system.

[0024] Preferably, the preset temperature range is 160℃~165℃, the first temperature range is 165℃~200℃, and the second temperature range is greater than 200℃; the first power range is 130W~135W, the second power range is 140W~145W, and the third power range is 120W~125W.

[0025] Compared with the prior art, the beneficial effects of this application are as follows: After clamping and fixing the aluminum-plastic film with a clamping fixture, the aluminum-plastic film is laser welded by a laser welding system, and the temperature of the weld area of ​​the aluminum-plastic film is detected by a temperature measuring system. At the same time, the integrated control system is communicatively connected to the displacement drive system, the laser welding system, the clamping fixture, the cooling system, and the temperature measuring system, respectively. This allows the temperature measuring system to feed back the detected weld area temperature to the integrated control system in real time during the welding process. The integrated control system can control the laser welding system and / or the cooling system based on the weld area temperature fed back by the temperature measuring system. This improves the controllability of the weld area temperature during the laser welding of the aluminum-plastic film, avoids the formation of a molten pool in the weld area under the action of high-temperature laser during the laser welding of the aluminum-plastic film, which would cause damage to the aluminum-plastic film, and avoids the weld area temperature being too low during the laser welding of the aluminum-plastic film, which would result in insufficient welding of the aluminum-plastic film. In this way, the laser welding quality of the aluminum-plastic film can be improved, the sealing performance of the aluminum-plastic film can be improved, and the safety of the soft-pack battery can be improved. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments of this application or the prior art will be briefly introduced below. Obviously, the accompanying drawings described below are only a part of the embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the aluminum-plastic film welding device in one embodiment of this application;

[0028] Figure 2 This is a schematic diagram of the clamping fixture in one embodiment of this application;

[0029] Figure 3 This is a schematic flowchart of an aluminum-plastic film welding method in one embodiment of this application.

[0030] Figure Labels

[0031] 1. Displacement drive system; 2. Laser welding system; 21. Laser emitter; 22. Scanning galvanometer assembly; 3. Clamping fixture; 31. Upper clamping plate; 311. Welding window; 32. Lower clamping plate; 33. Clamping drive assembly; 34. Pressure detection assembly; 4. Cooling system; 41. Electronic regulating valve; 42. Cold water pipe; 5. Temperature measurement system; 6. Integrated control system; 7. Temperature display system. Detailed Implementation

[0032] The following drawings disclose several embodiments of this application. For clarity, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit this application. That is, in some embodiments of this application, these practical details are not essential. In addition, for the sake of simplicity, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0033] It should be noted that all directional indications in the embodiments of this application, such as up, down, left, right, front, back, etc., are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indication will also change accordingly.

[0034] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit this application. They are merely used to distinguish components or operations described using the same technical terms and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If a combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0035] To further understand the invention's content, features, and effects, the following embodiments are provided, along with detailed descriptions in conjunction with the accompanying drawings:

[0036] It should be noted that the aluminum-plastic film laser welding in this application is particularly applicable to highly corrosive environments such as soft-pack batteries; those skilled in the art will understand that it is also applicable to non-highly corrosive environments such as food packaging.

[0037] Aluminum-plastic film consists of an outer layer, a middle layer, and an inner layer. The outer layer is typically a nylon layer, the middle layer is typically aluminum foil and an adhesive, and the inner layer is typically a heat-sealing layer, CPP (polypropylene). When packaging pouch batteries, to ensure their sealing and corrosion resistance, connections between the inner heat-sealing CPP layers are necessary to achieve a sealing effect. Since CPP layers are micrometer-scale, the connection between CPP layers can be referred to as micro-interface connection.

[0038] One embodiment of this application provides an aluminum-plastic film welding device for laser welding of aluminum-plastic films to achieve micro-interfaces between the CPP layers of the aluminum-plastic film, such as... Figure 1 As shown.

[0039] Figure 1 This is a schematic diagram of the aluminum-plastic film welding device in this embodiment. It includes a laser welding system 2, a displacement driving system 1 for driving the laser welding system 2, and a clamping fixture 3 positioned along the movement path of the laser welding system 2. The clamping fixture 3 is used to clamp and fix the aluminum-plastic film. The displacement driving system 1 drives the laser welding system 2 to move along a preset welding path. The laser welding system 2 emits a laser beam that passes through the clamping fixture 3 and welds the aluminum-plastic film. A cooling system 4 is connected to the clamping fixture 3, and the cooling system 4 supplies coolant to the clamping fixture 3 to cool the aluminum-plastic film. A temperature measuring system 5 detects the temperature of the weld seam area of ​​the aluminum-plastic film. An integrated control system 6 is also included. The system is communicatively connected to the displacement drive system 1, laser welding system 2, clamping fixture 3, cooling system 4, and temperature measurement system 5. The integrated control system 6 then controls the coordinated operation of each system. During the welding process, the temperature measurement system 5 monitors the temperature of the aluminum-plastic film weld zone in real time and feeds back the detected weld zone temperature to the integrated control system 6. The integrated control system 6 controls the laser welding system 2 and the cooling system 4 based on the weld zone temperature to regulate the weld zone temperature of the aluminum-plastic film, achieving micro-interface connection of the aluminum-plastic film. This avoids damage to the aluminum-plastic film due to high temperature generating a molten pool or weak welding due to low temperature during the micro-interface welding process, thereby improving the sealing performance of the aluminum-plastic film micro-laser welding.

[0040] Specifically, in the above scheme, such as Figure 2 As shown, Figure 2This is a schematic diagram of the clamping fixture structure in this embodiment. The clamping fixture 3 includes an upper clamping plate 31, a lower clamping plate 32 for supporting the aluminum-plastic film, and a clamping drive assembly 33 for driving the lower clamping plate 32 to move toward the upper clamping plate 31. The lower clamping plate 32 is connected to the cooling system 4. The clamping drive assembly 33 drives the lower clamping plate 32 to move toward the upper clamping plate 31, thereby clamping and fixing the aluminum-plastic film through the cooperation of the lower clamping plate 32 and the upper clamping plate 31. This allows the aluminum-plastic film to be welded through the upper clamping plate 31 in the subsequent welding process. The cooling system 4 is provided inside the lower clamping plate 32. During the welding process, the aluminum-plastic film contacts the lower clamping plate 32, and the cooling system 4 removes some of the heat generated during the welding process, thereby dissipating heat from the aluminum-plastic film and preventing it from overheating and being welded through during the welding process. This improves the welding quality of the aluminum-plastic film and also improves the sealing of the micro-interface connection of the aluminum-plastic film.

[0041] Furthermore, in the above scheme, the lower clamping plate 32 has several flow channels inside, and the cooling system 4 includes several cold water pipes 42 connected to the flow channels, and an electronic regulating valve 41 for adjusting the water flow of the cold water pipes 42. The cold water pipes 42 are connected to the flow channels of the lower clamping plate 32 after passing through the electronic regulating valve 41. By injecting flowing coolant, some of the heat from the lower clamping plate 32 is carried away, thereby dissipating heat from the aluminum-plastic film. During the micro-interface welding process of the aluminum-plastic film, the flow rate and volume of the coolant are controlled by the electronic regulating valve 41 to regulate the welding temperature of the aluminum-plastic film, so that the weld area of ​​the aluminum-plastic film is in an optimal temperature state during the welding process, realizing the micro-interface connection of the aluminum-plastic film, and thus improving the welding quality of the aluminum-plastic film.

[0042] To control the clamping pressure of the aluminum-plastic film, in the above scheme, the clamping drive assembly 33 is connected to the lower clamping plate 32 via a pressure detection assembly 34. The clamping drive assembly 33 can be hydraulically driven or a telescopic cylinder, etc. The pressure detection assembly 34 is a pressure sensor. When the clamping drive assembly 33 drives the lower clamping plate 32 and the upper clamping plate 31 to clamp the aluminum-plastic film, the pressure sensor detects the clamping pressure value of the aluminum-plastic film in real time, so that the aluminum-plastic film is compressed during the welding process, improving the stability of the aluminum-plastic film welding and thus improving the welding quality. At the same time, by detecting the pressure value, the aluminum-plastic film is prevented from being damaged by overpressure, which can improve the sealing performance of the aluminum-plastic film. Furthermore, the pressure detection assembly 34 can feed back the pressure value to the integrated control system 6, which can then regulate the clamping pressure of the clamping fixture 3 to prevent the aluminum-plastic film from shifting due to insufficient clamping pressure or from being damaged due to excessive clamping pressure during the welding process, thereby improving the sealing performance of the aluminum-plastic film and increasing the yield.

[0043] After the lower clamping plate 32 and the upper clamping plate 31 clamp and fix the aluminum-plastic film, the laser welding system 2 is driven by the displacement driving system 1 to move along the preset welding trajectory, thereby realizing the micro-interface welding of the aluminum-plastic film clamped by the clamping fixture 3. Among them, the upper clamping plate 31 is provided with a welding window 311 for the laser of the laser welding system 2 to pass through, and the welding laser can weld the aluminum-plastic film through the welding window 311. Optionally, a transparent quartz glass is provided inside the welding window 311 of the upper clamping plate 31, allowing the laser from the laser welding system 2 to pass through. This enables visual welding through the transparent quartz glass, allowing real-time monitoring of the aluminum-plastic film during the welding process and improving the welding quality. Optionally, when the lower clamping plate 32 and the upper clamping plate 31 clamp the aluminum-plastic film, the quartz glass is pressed tightly against the aluminum-plastic film, improving heat dissipation during laser welding and further achieving the purpose of heat dissipation. Optionally, the temperature measuring system 5 can specifically adopt infrared temperature measurement. The transparent quartz glass inside the welding window 311 of the upper clamping plate 31 also allows the infrared light emitted by the temperature measuring system 5 to pass through, enabling real-time detection of the temperature of the weld area of ​​the aluminum-plastic film.

[0044] The laser welding system 2 includes a scanning galvanometer assembly 22 and a laser emitter 21 connected to the scanning galvanometer assembly 22. The scanning galvanometer assembly 22 is located in front of the laser emitter 21. The scanning galvanometer assembly 22 scans the aluminum-plastic film on the clamping fixture 3 to scan the welding path. Then, the laser emitter 21 is moved along the preset welding path by the displacement drive system 1. The displacement drive system 1 can be a three-dimensional motion mechanism to drive the laser emitter 21 to move along three axes. By setting appropriate welding parameters, such as laser scanning path, scanning radius, defocusing amount, and welding speed, the welding process can be controlled more precisely to achieve micro-interface connection of the aluminum-plastic film.

[0045] Optionally, to achieve real-time temperature measurement of the aluminum-plastic film on the clamping fixture 3, a temperature measuring system 5 is installed on the laser welding system 2. The temperature measuring system 5 can move with the laser welding system 2 to detect the temperature of the weld zone of the aluminum-plastic film in real time. Optionally, a temperature display system 7 is installed on the clamping fixture 3, which is communicatively connected to the temperature measuring system 5. The temperature measuring system 5 feeds back the detected weld zone temperature to the integrated control system 6 in real time. At the same time, the temperature measuring system 5 is communicatively connected to the temperature display system 7 and / or the integrated control system 6, so that the weld zone temperature detected by the temperature measuring system 5 can be displayed through the temperature display system 7, making it convenient for operators to view the real-time temperature.

[0046] In actual production, the temperature measurement system 5 can be an infrared thermometer. Since laser welding creates a weld seam of a certain depth at the weld joint, directly measuring the temperature at the laser focal point as the actual welding temperature of the aluminum-plastic film would lead to inaccurate temperature measurement. Therefore, the temperature acquisition area of ​​the temperature measurement system 5 needs to extend deeper into the weld seam area of ​​the aluminum-plastic film compared to the laser focal point. Optionally, the temperature acquisition area of ​​the temperature measurement system 5 can be the weld seam area 0-1.5 mm behind the focal point. In this embodiment, it is preferable to measure the temperature of the weld seam area 1 mm behind the laser focal point as the actual temperature of the aluminum-plastic film to improve the accuracy of temperature control in the weld seam area.

[0047] On the other hand, such as Figure 3 As shown, this embodiment also provides an aluminum-plastic film welding method, which can be applied to an aluminum-plastic film welding device, specifically the aluminum-plastic film welding device described above, to achieve micro-interface welding of the aluminum-plastic film. Specifically, the aluminum-plastic film welding device includes: a temperature measuring system 5, a cooling system 4, and an integrated control system 6. The integrated control system 6 is communicatively connected to the temperature measuring system 5 and the cooling system 4. The aluminum-plastic film welding method includes the following steps:

[0048] S1: Obtain the temperature of the weld zone of the aluminum-plastic film detected by the temperature measuring system 5;

[0049] S2: If the temperature of the weld zone exceeds the preset temperature range, the laser welding parameters of the laser welding system 2 and / or the cooling parameters of the cooling system 4 shall be adjusted so that the temperature of the weld zone of the aluminum-plastic film is within the preset temperature range.

[0050] The preset temperature range can be the temperature range corresponding to the sealing connection between the heat-sealing layers of the aluminum-plastic film during laser welding; the weld zone temperature of the aluminum-plastic film refers to the temperature of the area where the weld seam is formed when the aluminum-plastic film is laser welded; the laser welding parameters of the laser welding system 2 refer to the parameters that can be adjusted by the laser welding system 2 during the laser welding process to achieve the temperature control of the weld zone of the aluminum-plastic film, which may include: laser scanning path, scanning radius, defocusing amount, welding speed, welding frequency, laser emission power, etc.; the cooling parameters of the cooling system 4 refer to the parameters that can be adjusted by the cooling system 4 during the laser welding process to achieve the temperature control of the weld zone of the aluminum-plastic film, which may include: cooling water flow rate and flow rate, etc., which are not specifically limited here.

[0051] Optionally, the cooling system 4 introduces coolant into the clamping fixture 3, and the aluminum-plastic film on the clamping fixture 3 is cooled by the flow of coolant. Correspondingly, the cooling parameters may include the coolant flow rate (the flow rate of the coolant introduced into the clamping fixture 3), and the laser welding parameters include the laser emission power. In step S2, adjusting the laser welding parameters of the laser welding system 2 and / or the cooling parameters of the cooling system to ensure that the temperature of the weld zone of the aluminum-plastic film is within a preset temperature range includes:

[0052] If the temperature in the weld zone is lower than the preset temperature range, the laser emission power of the laser welding system 2 is increased to the first power range;

[0053] If the temperature of the weld zone is greater than the preset temperature range and the temperature of the weld zone is within the first temperature range, then the laser emission power of the laser welding system 2 is increased to the second power range, and the coolant flow rate of the cooling system 4 is adjusted to the first speed range.

[0054] If the temperature of the weld zone is greater than the preset temperature range and the temperature of the weld zone is within the second temperature range, then the laser emission power of the laser welding system 2 is reduced to the third power range, and the coolant flow rate of the cooling system 4 is increased to the second speed range.

[0055] Among them, the preset temperature range is smaller than the first temperature range, the first temperature range is smaller than the second temperature range, the first power range is smaller than the second power range, the third power range is smaller than the first power range, and the first speed range is smaller than the second speed range.

[0056] In one embodiment of this application, the first speed range can be 5-6 L / min, and the second speed range can be 10-12 L / min. The preset temperature range can be 160℃-165℃, the first temperature range can be 165℃-200℃, and the second temperature range can be above 200℃. The first power range can be 130W-135W, the second power range can be 140W-145W, and the third power range can be 120W-125W.

[0057] Optionally, the aluminum-plastic film welding device further includes a displacement driving system 1, which drives the laser welding system 2 to move so as to move the temperature measuring system 5; before step S1, the method further includes:

[0058] The displacement driving system is controlled to drive the laser welding system 2 to move its position so that the temperature acquisition area of ​​the temperature measuring system 5 is located in the weld seam area of ​​the aluminum-plastic film.

[0059] It should be noted that, in order to achieve laser welding of the aluminum-plastic film, the laser welding system 2 will be adjusted to a suitable position to ensure that laser welding can be performed on the preset position of the aluminum-plastic film. The laser beam spot generated by the laser welding system 2 is located in the weld area of ​​the aluminum-plastic film, but the beam spot emitted by the temperature measuring system 5 may not be located in the weld area of ​​the aluminum-plastic film. Therefore, in order to ensure that the temperature acquisition area of ​​the temperature measuring system 5 is located within the weld area of ​​the aluminum-plastic film, the positional relationship between the laser spot formed by the laser emitted by the laser welding system 2 (denoted as the first beam guiding spot) and the infrared light spot formed by the temperature measuring system (denoted as the second beam guiding spot) can be compared. Based on the positional relationship between the first beam guiding spot and the second beam guiding spot, the displacement drive system can be controlled to drive the laser welding system 2 to move. Specifically, the displacement driving system can be controlled to move the laser welding system 2 based on the spot distance between the first and second beam guiding spots; or, a coordinate system can be established by collecting spot images and combining them with the welding trajectory, and the displacement driving system can be controlled to move the laser welding system 2 based on the relative position of the second beam guiding spot in the coordinate system with respect to the first beam guiding spot on the welding trajectory, so that the temperature acquisition area of ​​the temperature measuring system 5 is located in the weld area of ​​the aluminum-plastic film.

[0060] Optionally, if the displacement driving system is used to drive the laser welding system 2 to move its position based on the spot distance between the first and second light spots, then the step of controlling the displacement driving system to drive the laser welding system 2 to move its position so that the temperature acquisition area of ​​the temperature measuring system 5 is located in the weld area of ​​the aluminum-plastic film may include:

[0061] Acquire the first beam guiding spot of the laser welding system 2 and the second beam guiding spot of the temperature measuring system 5;

[0062] Obtain the beam distance between the first beam guiding spot and the second beam guiding spot;

[0063] The displacement driving system 1 drives the laser welding driving system 2 according to the spot distance, so that the temperature acquisition area of ​​the temperature measuring system 5 is located within a preset distance range behind the focal point of the laser welding system 2.

[0064] Optionally, the preset distance range can be within 0-1.5mm, preferably within 0-0.5mm, and can be set according to actual conditions, without limitation here. Optionally, when controlling the displacement driving system 1 to drive the laser welding driving system 2 according to the spot distance, specifically: when the spot distance is greater than the preset distance range, it is considered that the temperature acquisition area of ​​the temperature measuring system 5 is not located within the preset distance range behind the focal point of the laser welding system 2. At this time, it is necessary to control the displacement driving system to drive the laser welding driving system 2 to reduce the spot distance so that the temperature acquisition area of ​​the temperature measuring system 5 is located within the preset distance range behind the focal point of the laser welding system 2; when the spot distance is less than or equal to the preset distance range, it is considered that the temperature acquisition area of ​​the temperature measuring system is located within the preset distance range behind the focal point of the laser welding system 2.

[0065] In a specific application example, after the laser welding system 2 is driven to the welding position by the displacement drive system 1, the integrated control system 6 controls the clamping fixture 3, causing the clamping drive assembly 33 to drive the lower clamping plate 32 to rise and clamp the aluminum-plastic film. Then, the laser emitter 21 emits a laser beam that passes through the upper clamping plate 31 to weld the micro-interface of the aluminum-plastic film. Simultaneously, the temperature measurement system 5 detects the temperature of the aluminum-plastic film and feeds it back to the integrated control system 6. The integrated control system 6 controls the laser power of the laser welding system 2 and / or controls the coolant flow rate of the cooling system 4 based on the actual temperature to regulate the temperature of the weld zone of the aluminum-plastic film, improving the controllability of the weld zone temperature during the micro-interface welding process and thus improving the sealing performance of the aluminum-plastic film micro-interface connection. Specifically, the aluminum-plastic film welding method in this application example includes the following steps:

[0066] A1. Place the aluminum-plastic film in the clamping area of ​​the clamping fixture 3, and clamp the aluminum-plastic film with a pressure of 100N to 120N.

[0067] The clamping drive assembly 33 of the clamping fixture 3 drives the lower clamping plate 32 towards the upper clamping plate 31, thereby clamping and fixing the aluminum-plastic film through the cooperation of the lower clamping plate 32 and the upper clamping plate 31. This prevents the aluminum-plastic film from deviating in position during the welding process, and enables accurate welding of the aluminum-plastic film through the upper clamping plate 31 in subsequent welding processes, improving the accuracy of the welding position. To clamp the aluminum-plastic film and avoid damaging it, the clamping fixture 3 clamps and fixes the aluminum-plastic film with a pressure of 100N to 120N. The pressure detection assembly 34 detects the clamping pressure in real time and feeds it back to the integrated control system 6. The integrated control system 6 controls the clamping drive assembly 33 to control the clamping pressure of the aluminum-plastic film. The clamping pressure of the clamping fixture 3 is preferably 100N, so as to clamp the aluminum-plastic film while avoiding damage to it.

[0068] A2. Turn on the integrated control system 6, temperature measurement system 5, and cooling system 4, and set the laser welding parameters of the laser welding system 2, such as laser scanning path, scanning radius, defocusing amount, and welding speed.

[0069] By setting the scanning radius of the scanning galvanometer assembly 22 to 2mm, a suitable welding area is determined, avoiding situations where the welding area is too small to effectively weld the aluminum-plastic film, or too large, resulting in resource waste and difficulty in precise control. By setting the defocusing amount to 0mm and the welding speed of the laser emitter 21 to 150mm / s, and configuring a suitable scanning path and welding speed, the welding position accuracy is improved, and the welding quality of the aluminum-plastic film is enhanced.

[0070] A3. Adjust the position of the temperature measuring system 5 so that the temperature acquisition area of ​​the temperature measuring system 5 is located in the weld area of ​​the aluminum-plastic film;

[0071] The displacement drive system 1 drives the laser welding system 2 to move its position to adjust the position of the temperature measuring system 5, so that the temperature acquisition area is adjusted to be 1-1.5mm behind the laser focus of the laser welding system 2, so that the temperature acquisition area of ​​the temperature measuring system 5 is located in the weld area of ​​the aluminum-plastic film, so as to facilitate real-time acquisition of the temperature of the weld area of ​​the aluminum-plastic film and improve the accuracy of temperature acquisition.

[0072] A4. Start the laser welding system 2. Drive the laser welding system 2 to move through the displacement drive system 1 to weld the aluminum-plastic film. During the welding process, the temperature of the aluminum-plastic film weld area is maintained at 160℃~165℃ by adjusting the laser emission power of the laser welding system 2 and / or the coolant flow rate of the cooling system 4.

[0073] It should be noted that when welding begins, if the temperature measurement system 5 detects that the temperature of the weld area is below 160°C, it will feed back the detected temperature to the integrated control system 6. The integrated control system 6 will control the laser emission power of the laser welding system 2 and set the laser power of the laser emitter 21 of the laser welding system 2 to 130W, so that the temperature of the aluminum-plastic film weld area is maintained at 160°C to 165°C, preferably 160°C, in order to improve the welding quality of the aluminum-plastic film.

[0074] Specifically, when the temperature of the weld zone of the aluminum-plastic film is below 160°C, the laser emission power of the laser welding system 2 is increased to 130W; when the temperature of the weld zone of the aluminum-plastic film is between 165°C and 200°C, the laser emission power of the laser welding system 2 is increased to 140W, and the cooling system 4 is turned on, adjusting the coolant flow rate to 5L / min. The coolant carries away some of the heat from the aluminum-plastic film, stabilizing the temperature of the weld zone at 160°C; when the temperature of the weld zone is detected to be above 200°C, the laser emission power of the laser welding system 2 is reduced to 120W, and the coolant flow rate is increased to 10L / min to ensure that the temperature of the weld zone is stabilized at 160°C.

[0075] A5: After completing the laser welding of the aluminum-plastic film, remove the workpiece and shut down the displacement drive system 1, laser welding system 2, clamping fixture 3, cooling system 4, temperature measurement system 5, and integrated control system 6 to improve the safety of aluminum-plastic film laser welding and avoid resource waste.

[0076] In summary, in one or more embodiments of this application, the solution uses a clamping fixture to clamp and fix the aluminum-plastic film, and then uses a laser welding system to weld the clamped and fixed aluminum-plastic film. During the welding process, a temperature measuring system monitors the temperature of the weld area of ​​the aluminum-plastic film in real time and feeds it back to the integrated control system. The integrated control system then regulates the laser welding system and / or the cooling system, enabling real-time control of the weld area temperature of the aluminum-plastic film. This improves the welding quality, enhances the sealing performance of the aluminum-plastic film, and ultimately improves its safety in application environments with stringent requirements for sealing performance, such as those with strong corrosion.

[0077] The embodiments described above do not constitute a limitation on the scope of protection of this technical solution. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the above embodiments should be included within the scope of protection of this technical solution.

Claims

1. An aluminum-plastic film welding method using an aluminum-plastic film welding device, characterized in that: Aluminum-plastic film welding equipment includes Clamping fixture (3) is used to clamp aluminum-plastic film; Laser welding system (2) is used to perform laser welding on the clamped aluminum-plastic film; A cooling system (4) is connected to the clamping fixture (3) and is used to cool the aluminum-plastic film; A temperature measuring system (5) is installed on the laser welding system (2) to detect the temperature of the weld zone of the aluminum-plastic film; An integrated control system (6) is communicatively connected to the laser welding system (2), the clamping fixture (3), the cooling system (4), and the temperature measuring system (5), respectively. The temperature measuring system (5) feeds back the temperature of the weld area of ​​the aluminum-plastic film to the integrated control system (6). The integrated control system (6) controls the laser welding system (2) and / or the cooling system (4) according to the temperature of the weld area of ​​the aluminum-plastic film so that the temperature of the weld area of ​​the aluminum-plastic film is within a preset temperature range. The aluminum-plastic film welding method includes the following steps: S1: Obtain the temperature of the weld zone of the aluminum-plastic film detected by the temperature measurement system (5); S2: If the temperature of the weld zone exceeds the preset temperature range, the laser welding parameters of the laser welding system (2) and / or the cooling parameters of the cooling system (4) are adjusted so that the temperature of the weld zone of the aluminum-plastic film is within the preset temperature range. The cooling system (4) introduces coolant into the clamping fixture (3) to cool the aluminum-plastic film on the clamping fixture (3) through the flow of coolant. The cooling parameters include the coolant flow rate, and the laser welding parameters include the laser emission power. In step S2, adjusting the laser welding parameters of the laser welding system (2) and / or the cooling parameters of the cooling system to ensure that the temperature of the weld zone of the aluminum-plastic film is within the preset temperature range includes: If the temperature of the weld zone is less than the preset temperature range, the laser emission power of the laser welding system (2) is increased to the first power range; If the temperature of the weld zone is greater than the preset temperature range and the temperature of the weld zone is within the first temperature range, then the laser emission power of the laser welding system (2) is increased to the second power range, and the coolant flow rate of the cooling system (4) is adjusted to the first speed range; If the temperature of the weld zone is greater than the preset temperature range and the temperature of the weld zone is within the second temperature range, then the laser emission power of the laser welding system (2) is reduced to the third power range, and the coolant flow rate of the cooling system (4) is increased to the second speed range; Wherein, the preset temperature range is smaller than the first temperature range, the first temperature range is smaller than the second temperature range; the first power range is smaller than the second power range, the third power range is smaller than the first power range; and the first speed range is smaller than the second speed range. The aluminum-plastic film welding device further includes a displacement driving system (1), which is used to drive the laser welding system (2) to move so as to move the temperature measuring system (5); before step S1, the method further includes: The displacement driving system is controlled to drive the laser welding system (2) to move its position so that the temperature acquisition area of ​​the temperature measuring system (5) is located in the weld area of ​​the aluminum-plastic film; The step of controlling the displacement driving system to drive the laser welding system (2) to move its position so that the temperature acquisition area of ​​the temperature measuring system (5) is located in the weld area of ​​the aluminum-plastic film includes: Acquire the first beam guiding spot of the laser welding system (2) and the second beam guiding spot of the temperature measuring system (5); Obtain the beam distance between the first beam guiding spot and the second beam guiding spot; The displacement driving system is controlled according to the spot distance to drive the laser welding system (2) so that the temperature acquisition area of ​​the temperature measuring system is located within a preset distance range behind the focal point of the laser welding system (2).

2. The aluminum-plastic film welding method of the aluminum-plastic film welding device according to claim 1, characterized in that: The clamping fixture (3) includes an upper clamping plate (31), a lower clamping plate (32) for carrying aluminum-plastic film, and a drive assembly (33) for driving the lower clamping plate (32) to move toward the upper clamping plate (31). The cooling system (4) is connected to the lower clamping plate (32).

3. The aluminum-plastic film welding method of the aluminum-plastic film welding device according to claim 2, characterized in that: The lower clamp (32) has at least two flow channels inside, and the cooling system (4) includes a cold water pipe (42) that is connected to each of the flow channels, and at least one electronic regulating valve (41) for regulating the water flow of the cold water pipe (42).

4. The aluminum-plastic film welding method of the aluminum-plastic film welding device according to claim 2, characterized in that: The drive assembly (33) is connected to the lower clamping plate (32) via the pressure detection assembly (34).

5. The aluminum-plastic film welding method of the aluminum-plastic film welding device according to claim 1, characterized in that: The aluminum-plastic film welding device also includes a displacement driving system (1), which is used to drive the laser welding system (2) to move so as to move the temperature measuring system (5) so that the temperature acquisition area of ​​the temperature measuring system is located in the weld seam area of ​​the aluminum-plastic film.

6. The aluminum-plastic film welding method of the aluminum-plastic film welding device according to claim 1, characterized in that: The preset temperature range is 160℃~165℃, the first temperature range is 165℃~200℃, and the second temperature range is above 200℃; the first power range is 130W~135W, the second power range is 140W~145W, and the third power range is 120W~125W.

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