Disassembling method of welding structure

Abstract

The invention provides a disassembling method of a welding structure, the welding structure is formed by welding a first component and a second component needing to be recycled, and the disassembling method is characterized by comprising the following steps: positioning the welding structure, and identifying a welding seam on the welding structure; based on the welding seam, a disassembling area is planned; and a laser beam is projected into the disassembling area, and laser cleaning is conducted on the disassembling area through the laser beam. According to the invention, the complete function and structure of the second component needing to be recycled, namely the single battery in the example, can be ensured, the disassembly stability is good, the disassembly cost is low, and the efficiency is high.

Description

Technical Field

[0001] The present invention relates to the technical field of disassembling welding structures, and in particular to a method for disassembling welding structures. Background Art

[0002] Welding, also known as welding, is a manufacturing process and technology that joins metals or other thermoplastic materials such as plastics by heating, high temperature or high pressure. However, during the welding process, it is often encountered that the welded workpiece needs to be disassembled and recycled for reuse due to problems such as welding defects. For example, the welding of single cells and bars in the new energy industry, specifically the welding of the poles and bars of single cells, occurs in the process of connecting several single cells in series through bars to form a battery module. Once the welding quality of some single cells is not up to standard, it will affect the quality of the entire battery module. In order to save costs, the single cells and bars with unsatisfactory welding quality are usually disassembled, and the bar structure corresponding to the single cell is replaced, and the single cell is recycled for secondary use. This is different from the traditional disassembly and recycling, but it is to ensure the integrity of the single cell pole function for subsequent use. Traditional mechanical disassembly, such as manual drill disassembly or mechanical milling disassembly, has the problem of serious deformation or damage of the battery pole after disassembly, which affects the secondary use of the single cell. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the object of the present invention is to provide a method for disassembling a welded structure, which has good disassembly stability, low disassembly cost and high efficiency.

[0004] The embodiments of the present invention are achieved through the following technical solutions:

[0005] A method for dismantling a welded structure, wherein the welded structure is formed by welding a first component and a second component to be recycled, comprising the following steps:

[0006] Locate welded structures and identify welds on welded structures;

[0007] Based on the welds, planning the disassembly area;

[0008] A laser beam is projected into the disassembly area, and the disassembly area is laser cleaned by the laser beam.

[0009] According to a preferred embodiment, the disassembly area completely covers the weld.

[0010] According to a preferred embodiment, the laser beam is projected onto a light spot on the disassembly area and moves along a spiral trajectory to perform laser cleaning.

[0011] According to a preferred embodiment, the laser cleaning speed is 8000 mm / s-13000 mm / s, and the laser power is 1600W-1900W.

[0012] According to a preferred embodiment, the spacing between the filling lines of the laser cleaning is 0.05 mm to 0.08 mm.

[0013] According to a preferred embodiment, the weld is cleaned at least once in the depth direction, and the depth of a single cleaning is 0.3 mm to 0.7 mm.

[0014] According to a preferred embodiment, in the depth direction of the weld, the laser cleaning depth is less than the thickness of the first component.

[0015] According to a preferred embodiment, in the depth direction of the weld, after the weld is laser cleaned, a cleaning groove is formed on the first component. After the last cleaning is completed, the distance between the bottom inner side of the cleaning groove and the side of the first component facing the second component is D, 0mm<D≤0.2mm.

[0016] According to a preferred embodiment, after projecting a laser beam into the disassembly area and performing laser cleaning on the disassembly area by the laser beam, the method further includes: separating the cleaned tabs and the single battery cells, and then performing laser polishing on the surface of the second component.

[0017] According to a preferred embodiment, the laser power for laser polishing is half of the laser power for laser cleaning.

[0018] The technical solutions of the embodiments of the present invention have at least the following advantages and beneficial effects:

[0019] The welding structure disassembly method provided by the present invention can ensure that the second component to be recycled, that is, the single battery in the example, has intact functions and structures, good disassembly stability, low disassembly cost and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A flow chart of a method for disassembling a welding structure provided by an embodiment of the present invention;

[0022] Figure 2A top view of the welding structure of a single battery cell and a tab to be disassembled according to an embodiment of the present invention;

[0023] Figure 3 For Figure 1 Schematic diagram after planning the disassembly area based on the weld shown;

[0024] Figure 4 A schematic diagram of a laser cleaning path within a disassembly area provided by an embodiment of the present invention;

[0025] Figure 5 A cross-sectional view of a single cell and a tab welding structure provided in an embodiment of the present invention before laser cleaning;

[0026] Figure 6 A cross-sectional view of the single cell and tab welding structure after laser cleaning provided in an embodiment of the present invention.

[0027] Icons: 1- single cell, 11- pole, 2- tab, 3- weld, 4- disassembly area, X- depth direction. DETAILED DESCRIPTION

[0028] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0029] In the description of the present invention, it should be noted that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the present invention.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0031] Please refer to Figures 1 to 6 A method for dismantling a welded structure, wherein the welded structure is formed by welding a first component and a second component to be recycled, comprising the following steps:

[0032] Step S1: Positioning the welded structure and identifying the weld 3 on the welded structure;

[0033] Step S2: planning a disassembly area 4 based on the weld 3;

[0034] Step S3: Projecting a laser beam into the disassembly area 4 to perform laser cleaning on the disassembly area 4 by the laser beam.

[0035] In this embodiment, the welding of a single cell 1 and a tab 2 is used as an example for illustration. Tab 2 corresponds to the first component, and the single cell 1 corresponds to the second component to be recycled. In step S1, the single cell 1 is secured with a fixture (typically, the entire battery module is secured. The tab 2 and single cell 1 are welded during the assembly of several single cells 1 into a battery module. After welding is completed, the single cell 1 and the corresponding tab 2 are inspected to identify weld defects). A visual component, such as a CCD camera, is used to identify the weld seams 3 corresponding to the single cell 1 and tab 2 that require disassembly. In step S2, based on the weld seam 3 structure determined in step S1, the specific areas to be disassembled are planned. Specifically, during the disassembly process, the first component, tab 2, is partially dematerialized, i.e., destructively processed, to ensure the functional integrity of the second component, tab 2. It is understood that the removed tab 2 area is welded to the portion of the cell 1 terminal 11 to form a welded structure. Therefore, the planned disassembly area 4 should include all areas of the tab 2 that require removal. After obtaining the disassembly region 4, step S3 is executed to project a laser beam into the disassembly region 4 for laser cleaning to remove material from the bar 2. Disassembling the welded structure through the above steps ensures the functional and structural integrity of the second component to be recycled, i.e., the single battery 1 in the example, while ensuring good disassembly stability, low cost, and high efficiency.

[0036] like Figure 2 The welding structure of the single battery 1 and the tab 2 to be disassembled. Figure 3 As shown, Figure 2 The schematic diagram shows the disassembly area 4 after planning based on the weld 3. The disassembly area 4 is an annular area that completely covers the weld 3 to ensure that the welded structure is fully disassembled during the laser cleaning process.

[0037] like Figure 4 As shown, in some embodiments, the laser beam is projected onto the spot on the disassembly area 4 and performs laser cleaning along a spiral trajectory. This helps improve cleaning efficiency and uniformity, ensures cleaning quality, and further helps maintain the integrity of the second component, i.e., the terminal 11 of the single cell 1 in the aforementioned example. The spiral can proceed from the inner circle to the outer circle of the disassembly area 4, or from the outer circle to the inner circle.

[0038] In step S3, the laser cleaning speed is 8000 mm / s-13000 mm / s, the laser power is 1600 W-1900 W, and the filling line spacing of the laser cleaning is 0.05 mm-0.08 mm.

[0039] Furthermore, the weld 3 is cleaned at least once in the depth direction X, with a single cleaning depth of 0.3 mm to 0.7 mm. Preferably, the single cleaning depth is 0.5 mm. It should be noted that the number of laser cleanings is related to the thickness of the first component, i.e., the bar 2 in the aforementioned example. The thicker the first component, the more frequent cleanings are required.

[0040] In this embodiment, to prevent damage to the second component, namely, the terminal post 11 of the single cell 1, during the laser cleaning process, the laser cleaning depth in the depth direction X of the weld 3 is less than the thickness of the first component. The cleaning depth here refers to the total cleaning depth. For example, if the single cleaning depth is 0.5 mm and the number of cleanings is three, the total cleaning depth is 3 × 0.5 mm = 1.5 mm. This means that the thickness of the first component is greater than 1.5 mm. This ensures that the cleaning laser does not directly affect the second component, namely, the terminal post 11 of the single cell 1 in the aforementioned example.

[0041] like Figure 5 and Figure 6 As shown, in the depth direction X of the weld 3, the weld 3 penetrates the tab 2 and extends into the pole 11 of the single cell 1, and the connection between the tab 2 and the pole 11 is achieved through the molten area of ​​the weld 3. Therefore, disassembly can be achieved by simply removing the molten structure of the weld 3 through laser cleaning. Figure 6 As shown, in the depth direction X of the weld 3, after the weld 3 is laser cleaned, a cleaning groove is formed on the first component. After the last cleaning is completed, the distance between the inner side of the bottom of the cleaning groove and the side of the first component facing the second component is D, 0mm<D≤0.2mm. In this way, it is possible to avoid direct action on the pole 11 of the single cell 1 during laser cleaning, and to enable the tab 2 to maintain a stable relative position with the single cell 1 during the laser cleaning process, preventing the tab 2 from falling off or tilting during the laser cleaning process, affecting the normal cleaning work. At the same time, after the cleaning is completed, the tab 2 can be easily separated from the single cell 1 by external force. It should be noted that in the above situation, only the single cell 1 needs to be positioned, and there is no need to position the tab 2. This is due to 0mm<D≤0.2mm, which is conducive to improving processing efficiency and reducing work difficulty.

[0042] After the cleaned tabs 2 are separated from the cells 1, the surfaces of the posts 11 (the second component) of the cells 1 are laser polished at half the laser power used for laser cleaning. Low-power laser polishing prevents ablation of structures outside the polishing area and reduces the depth of focus, allowing the polishing laser to act like a thermal melt, improving the surface quality of the posts 11 while preserving the underlying structure.

[0043] In this embodiment, the laser power for laser cleaning is 1600W-1900W, while the laser power for laser polishing is 800W-950W. The defocus of the laser for laser polishing is +2mm. The polished single battery 1 can be recycled.

[0044] It should be noted that the laser used in this embodiment is a single-mode fiber laser with a wavelength of 1030nm-1070nm.

[0045] The technical means disclosed in the solutions of the present invention are not limited to those disclosed in the above-mentioned embodiments, but also include technical solutions composed of any combination of the above-mentioned technical features. It should be noted that those skilled in the art may make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for dismantling a welded structure, wherein the welded structure is formed by welding a first component and a second component to be recycled, characterized in that: The steps include: Locate welded structures and identify welds on welded structures; Based on the welds, planning the disassembly area; A laser beam is projected into the disassembly area, and the disassembly area is laser cleaned by the laser beam.

2. The method for dismantling a welded structure according to claim 1, wherein: The disassembly area completely covers the weld.

3. The method for dismantling a welded structure according to claim 1, wherein: The laser beam is projected onto a light spot on the disassembly area and moves along a spiral trajectory to perform laser cleaning.

4. The method for dismantling a welded structure according to claim 1, wherein: The laser cleaning speed is 8000mm / s-13000mm / s, and the laser power is 1600W-1900W.

5. The method for dismantling a welded structure according to claim 1, wherein: The filling line spacing of the laser cleaning is 0.05mm-0.08mm.

6. The method for dismantling a welded structure according to claim 1, wherein: In the depth direction of the weld, cleaning is performed at least once, and the depth of a single cleaning is 0.3 mm to 0.7 mm.

7. The method for dismantling a welded structure according to claim 6, wherein: In the depth direction of the weld, the laser cleaning depth is less than the thickness of the first component.

8. The method for dismantling a welded structure according to claim 7, wherein: In the depth direction of the weld, after laser cleaning the weld, a cleaning groove is formed on the first component. After the last cleaning is completed, the distance between the bottom inner side of the cleaning groove and the side of the first component facing the second component is D, 0mm<D≤0.2mm.

9. The method for dismantling a welded structure according to claim 1, wherein: After the step of projecting a laser beam into the disassembly area and performing laser cleaning on the disassembly area by the laser beam, the method further comprises: After the cleaned tabs and the single cells are separated, the surface of the second component is laser polished.

10. The method for dismantling a welded structure according to claim 9, wherein: The laser power for the laser polishing is half of the laser power for the laser cleaning.

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