A lithium ion battery electrode tab welding device

Abstract

The application discloses a lithium ion battery electrode tab welding device, and belongs to the technical field of magnetic component manufacturing. The device can improve the efficiency of lithium ion battery electrode tab welding. The device comprises a pretreatment module, a low-temperature electroplating module, a registration integration module, a mutual welding module, a low-temperature pressure maintaining module and a shaping and trimming module. The surface of the electrode tab welding area and the tab welding area of a target battery is pretreated to obtain clean electrode tabs and clean tabs. A low-melting-point metal plating layer is prepared on the surface of the to-be-welded area of the clean electrode tab to obtain a low-melting-point metal electrode tab. The clean tab and the low-melting-point metal electrode tab are registered and superimposed to obtain a superimposed body. Pressure is applied to the superimposed body and the superimposed body is heated to above the melting point of the low-melting-point metal plating layer to form a metallurgical bonding interface and obtain a welded assembly. The welded assembly is pressure maintained and cooled to obtain a solidified assembly. The solidified assembly is shaped to obtain a target welded piece.

Description

Technical Field

[0001] This invention relates to the field of magnetic component manufacturing technology, specifically a lithium-ion battery electrode tab welding device. Background Technology

[0002] Existing technologies have significant shortcomings in pretreatment and coating preparation before welding. The welding areas of the electrode sheets and tabs are not specifically cleaned, leaving residual impurities and oxide layers that can lead to poor bonding at the welding interface. Furthermore, the lack of precise application of selective electroplating processes prevents the efficient preparation of uniform low-melting-point metal coatings in the welding area, or results in coating thickness and purity that do not meet welding requirements, creating potential problems for subsequent metallurgical bonding and affecting the stability of welding quality.

[0003] Existing technologies have significant shortcomings in welding process control and post-processing. Precise and coordinated control of pressure and temperature is not achieved during welding, and the heating method lacks segmented optimization design, easily leading to insufficient melting of low-melting-point metals or overheating that damages the substrate. The pressure holding and cooling process does not maintain continuous and stable pressure, making the welded components prone to deformation or interface delamination during solidification. The lack of a systematic shaping and trimming process makes it impossible to accurately correct dimensional deviations and edge defects in the solidified components, ultimately resulting in welded parts whose appearance accuracy and structural reliability fail to meet the requirements of lithium-ion batteries. Summary of the Invention

[0004] The purpose of this invention is to provide a lithium-ion battery electrode tab welding device, which can achieve surface cleaning, precise coating, temperature control and pressure holding during the welding process, and shaping and repair of the electrode sheet and tab, improve the bonding strength and quality stability of the welding interface, meet the requirements of lithium-ion battery use, and solve the problems mentioned in the background art.

[0005] This application provides a lithium-ion battery electrode tab welding device, which includes a pretreatment module, a low-temperature electroplating module, an alignment and integration module, a mutual welding module, a low-temperature pressure holding module, and a shaping and trimming module.

[0006] The pretreatment module is used to perform surface pretreatment on the electrode sheet welding area and the tab welding area of ​​the target battery to obtain clean electrode sheets and clean tabs of the target battery.

[0007] The low-temperature electroplating module is used to prepare a low-melting-point metal coating on the surface of the area to be welded of the clean electrode sheet based on a selective electroplating process, thereby obtaining the low-melting-point metal electrode sheet of the target battery.

[0008] The alignment and integration module is used to align and stack the clean electrode tab with the low melting point metal electrode sheet to obtain the stack of the target battery.

[0009] The mutual welding module is used to apply pressure to the composite and heat it to above the melting point of the low melting point metal coating, so that the molten low melting point metal spreads and wets the clean electrode surface under pressure, forming a metallurgical bonding interface, and obtaining the welding assembly of the target battery.

[0010] The low-temperature pressure holding module is used to maintain pressure and cool the welding assembly to obtain the solidified assembly of the target battery;

[0011] The shaping and trimming module is used to shape the solidified component to obtain the target weldment of the target battery.

[0012] Furthermore, when the pretreatment module performs surface pretreatment on the electrode sheet welding area and the tab welding area of ​​the target battery to obtain clean electrode sheets and clean tabs of the target battery, it is specifically used for:

[0013] The electrode welding area of ​​the target battery is bombarded to obtain a clean electrode welding area of ​​the target battery.

[0014] Laser scanning is performed on the tab welding area of ​​the target battery to obtain a clean tab welding area of ​​the target battery;

[0015] The clean electrode sheet welding area and the clean electrode tab welding area are subjected to vacuum drying treatment to obtain the clean electrode sheet and clean electrode tab of the target battery.

[0016] Furthermore, when the low-temperature electroplating module performs a selective electroplating process to prepare a low-melting-point metal coating on the surface of the area to be welded on the clean electrode sheet, thereby obtaining the low-melting-point metal electrode sheet of the target battery, it is specifically used for:

[0017] Electroplating is performed on the area to be welded of the clean electrode sheet to activate the surface and obtain the activated clean electrode sheet of the target battery.

[0018] A mask layer is applied to the non-welding area on the activated clean electrode sheet, excluding the area to be welded, to obtain the mask-protected electrode sheet of the target battery;

[0019] The mask protection electrode sheet is placed as the cathode in an electroplating solution containing low-melting-point metal ions for electroplating treatment.

[0020] The low-melting-point metal ions are selectively deposited in the area to be welded to prepare a low-melting-point metal coating, thereby obtaining the intermediate-state coated electrode sheet of the target battery.

[0021] The intermediate-state coated electrode sheet is planarized to obtain the low-melting-point metal electrode sheet of the target battery.

[0022] Furthermore, when the alignment and integration module performs the alignment and stacking of the clean electrode tab and the low-melting-point metal electrode sheet to obtain the composite of the target battery, it is specifically used for:

[0023] Visual information is used to locate the clean electrode tab and the low-melting-point metal electrode sheet to determine the relative position information of the target battery.

[0024] Based on the relative position information, the spatial positional relationship between the clean electrode tab and the low melting point metal electrode sheet is adjusted to obtain the alignment electrode tab and alignment electrode sheet of the target battery.

[0025] The opposing tabs and opposing electrode sheets are stacked to obtain a temporary fixing assembly for the target battery.

[0026] The temporary fixing component is pre-pressed and bonded to obtain the stacked body of the target battery.

[0027] Furthermore, when the mutual welding module applies pressure to the laminate and heats it above the melting point of the low-melting-point metal coating, causing the molten low-melting-point metal to spread and wet the clean electrode surface under pressure, forming a metallurgical bonding interface to obtain the welding assembly of the target battery, it is specifically used for:

[0028] The composite is placed between the lower and upper pressure heads at the welding station, with the upper pressure head in contact with the upper surface of the composite and the lower pressure head in contact with the lower surface of the composite, to obtain the composite to be heated for the target battery.

[0029] An initial welding pressure is applied to the composite to be heated using the upper and lower pressure heads, so that the clean tabs and the low-melting-point metal electrode sheet are tightly bonded under pressure, thus obtaining the pre-compressed composite of the target battery.

[0030] While maintaining the initial welding pressure, the pre-compressed composite is heated by the heating elements in the upper and lower pressure heads;

[0031] The temperature of the pre-compressed composite is raised above the melting point of the low-melting-point metal coating, causing the low-melting-point metal coating to melt, thereby obtaining the molten metal intermediate of the target battery;

[0032] After the low-melting-point metal coating melts, adjust the pressure applied by the upper pressure head and the lower pressure head to the welding pressure;

[0033] The molten low-melting-point metal is spread outwards under the welding pressure and wets the surface of the clean electrode tab, forming an intermetallic compound bonding layer, thus obtaining the welded assembly of the target battery.

[0034] Furthermore, when the mutual welding module raises the temperature of the pre-compressed composite to above the melting point of the low-melting-point metal coating, thereby melting the low-melting-point metal coating and obtaining the molten metal intermediate of the target battery, it is specifically used for:

[0035] Set the target heating temperature of the heating element, which is higher than the melting point of the low-melting-point metal coating, and determine the heating process parameters of the target battery;

[0036] Based on the heating process parameters, the pre-compressed composite is heated in stages, so that the pre-compressed composite sequentially undergoes a preheating stage and a melting stage.

[0037] In the preheating stage, the pre-compressed composite is heated to a preheating temperature below the melting point of the low-melting-point metal coating at the first heating rate of the heating process parameters, to obtain the preheated composite of the target battery.

[0038] During the melting stage, the preheated composite is heated from the preheating temperature to the target heating temperature at the second heating rate of the heating process parameters to obtain the melted composite of the target battery.

[0039] The molten composite is subjected to heat preservation treatment to obtain the target battery molten metal intermediate.

[0040] Furthermore, when the cryogenic pressure holding module performs pressure holding and cooling on the welding assembly to obtain the solidified assembly of the target battery, it is specifically used for:

[0041] While maintaining the welding pressure, the upper pressure head and the lower pressure head are used to apply continuous pressure to the welding assembly to obtain the pressure-holding welding assembly of the target battery.

[0042] The pressure-holding welding assembly is cooled to obtain the cooled welding assembly of the target battery.

[0043] When the temperature of the cooling welding assembly drops below the solidification point of the low-melting-point metal coating, a preliminary solidified welding assembly of the target battery is obtained.

[0044] Release the pressure of the upper and lower pressure heads on the pre-cured welding assembly to obtain the solidified assembly of the target battery.

[0045] Furthermore, when the shaping and trimming module performs shaping processing on the consolidation assembly to obtain the target weldment of the target battery, it is specifically used for:

[0046] The outline dimensions and morphological features of the consolidated component are compared one by one with the preset standard welded part model to determine the area to be shaped and the amount of shaping of the consolidated component.

[0047] Based on the area to be shaped and the shaping amount, the excess portion of the edge of the solidification component is trimmed to obtain the trimmed solidification component of the target battery.

[0048] The cut and consolidated assembly is flattened to obtain a flat and consolidated assembly of the target battery.

[0049] The surface of the flattened and consolidated assembly is cleaned to obtain the target weldment of the target battery.

[0050] Furthermore, when the shaping and trimming module performs trimming processing on the excess portion of the edge of the solidified assembly based on the area to be shaped and the shaping amount to obtain the trimmed solidified assembly of the target battery, it is specifically used for:

[0051] Based on the area to be shaped and the shaping amount, the cutting path parameters of the consolidation component are generated;

[0052] Based on the cutting path parameters, the excess portion of the edge of the solidified component is removed to obtain the preliminary cut component of the target battery.

[0053] The cut edges of the initial cutting assembly are trimmed to obtain the cut and bonded assembly of the target battery.

[0054] Compared with the prior art, the beneficial effects of the present invention are:

[0055] 1. This invention lays a solid foundation for the quality of lithium-ion battery electrode tab welding through refined pretreatment and precise coating preparation. Targeted surface treatment and vacuum drying are performed on the welding areas of the electrode sheet and tab to effectively remove impurities and oxide layers, resulting in a high-cleanliness welding substrate. A selective electroplating process is used to precisely prepare a uniform and smooth low-melting-point metal coating on the area to be welded, ensuring a strong bond between the coating and the substrate. This provides a high-quality prerequisite for subsequent metallurgical bonding, improving the bonding quality and stability of the welding interface.

[0056] 2. This invention significantly improves the precision and reliability of welded parts by leveraging collaborative welding control and systematic post-processing. During the welding process, pressure and temperature are precisely controlled. Segmented heating ensures the full melting and spreading of low-melting-point metals, forming a dense metallurgical interface. Continuous pressure is maintained during the pressure-holding and cooling process to prevent deformation and interface delamination during solidification, thus enhancing the stability of the welded structure. Shaping processes such as contour comparison, precise cutting, flattening, and cleaning correct dimensional deviations and edge defects, resulting in a neat, dimensionally accurate, and reliable welded part that fully meets the requirements for lithium-ion battery applications.

[0057] Other features and advantages of the present invention will be disclosed in detail in the following detailed description and accompanying drawings. Attached Figure Description

[0058] Figure 1 This is a schematic diagram of an overall structure in an embodiment of the present invention. Detailed Implementation

[0059] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0060] In this embodiment of the invention, a lithium-ion battery electrode tab welding device is provided, see [link to previous document]. Figure 1 As shown,

[0061] The pretreatment module is used to perform surface pretreatment on the electrode sheet welding area and the tab welding area of ​​the target battery to obtain clean electrode sheets and clean tabs of the target battery.

[0062] In this embodiment, when the preprocessing module performs surface preprocessing on the electrode sheet welding area and the tab welding area of ​​the target battery to obtain clean electrode sheets and clean tabs of the target battery, it is specifically used for:

[0063] The electrode welding area of ​​the target battery is bombarded to obtain a clean electrode welding area of ​​the target battery.

[0064] Laser scanning is performed on the tab welding area of ​​the target battery to obtain a clean tab welding area of ​​the target battery;

[0065] The clean electrode sheet welding area and the clean electrode tab welding area are subjected to vacuum drying treatment to obtain the clean electrode sheet and clean electrode tab of the target battery.

[0066] An inert gas plasma bombardment device is selected, and the target battery is fixed on the device's special fixture to ensure that the electrode welding area is completely exposed within the bombardment range. After the device is started, the inert gas forms plasma under the action of a high-voltage electric field. The plasma impacts the surface of the electrode welding area at high speed, removing impurities such as oxide layer, oil, and dust through physical impact. At the same time, it roughens the surface microstructure, improving the bonding force of subsequent welding. After the treatment, a clean electrode welding area of ​​the target battery is obtained. The data source for this clean electrode welding area is the electrode welding area after plasma bombardment treatment.

[0067] A pulsed laser scanning device is used to adjust the scanning path of the laser so that it completely covers the tab welding area of ​​the target battery. After the laser is emitted, it acts on the surface of the tab welding area in a continuous scanning manner. The high temperature of the laser causes the oxide film and contaminants on the surface to vaporize or decompose instantly. At the same time, the impact force of the laser peels off the residual tiny impurity particles, ensuring that there are no impurities on the surface of the tab welding area that would affect the welding quality. After processing, a clean tab welding area of ​​the target battery is obtained. The data source of this clean tab welding area is the tab welding area after laser scanning processing.

[0068] The electrode sheet with the clean electrode welding area and the electrode tab with the clean electrode tab welding area are placed together in a vacuum drying oven. The drying oven is closed and the vacuum extraction function is activated to completely remove the air from the oven and maintain a vacuum environment. At the same time, a constant drying temperature is set, and the trace amounts of moisture adsorbed on the surface of the clean electrode sheet welding area and the clean electrode tab welding area are rapidly evaporated through heat transfer. The evaporated water vapor is promptly discharged from the drying oven to prevent re-adhesion. After a period of vacuum drying, the electrode sheet and electrode tab are removed to obtain the clean electrode sheet and clean electrode tab of the target battery. The data for the clean electrode sheet and clean electrode tab comes from the electrode sheet and electrode tab after vacuum drying.

[0069] The beneficial effects are that targeted bombardment treatment of the electrode welding area can effectively remove surface oxide layers, oil stains and dust and other impurities, while roughening the micro-morphology of the area surface, enhancing the bonding force in the subsequent welding process, and obtaining a clean electrode welding area that is suitable for welding.

[0070] The electrode welding area is treated with laser scanning. The high temperature of the laser causes the surface oxide film and contaminants to vaporize or decompose instantly. Combined with the laser impact force, tiny residual impurities are removed, ensuring that there are no interfering components in the electrode welding area that affect the welding quality, and obtaining a high-cleanliness electrode welding area.

[0071] Vacuum drying can quickly evaporate the trace amounts of moisture adsorbed on the surfaces of the clean electrode sheet welding area and the clean electrode tab welding area. The vacuum environment also prevents moisture from re-adhering, further improving the cleanliness of the two welding areas. This results in clean electrode sheets and clean electrode tabs, laying a solid foundation for subsequent coating preparation and welding processes, and ensuring the bonding quality and stability of the welding interface.

[0072] The low-temperature electroplating module is used to prepare a low-melting-point metal coating on the surface of the area to be welded of the clean electrode sheet based on a selective electroplating process, thereby obtaining the low-melting-point metal electrode sheet of the target battery.

[0073] In this embodiment, when the low-temperature electroplating module performs a selective electroplating process to prepare a low-melting-point metal coating on the surface of the area to be welded on the clean electrode sheet, thereby obtaining the low-melting-point metal electrode sheet of the target battery, it is specifically used for:

[0074] Electroplating is performed on the area to be welded of the clean electrode sheet to activate the surface and obtain the activated clean electrode sheet of the target battery.

[0075] A mask layer is applied to the non-welding area on the activated clean electrode sheet, excluding the area to be welded, to obtain the mask-protected electrode sheet of the target battery;

[0076] The mask protection electrode sheet is placed as the cathode in an electroplating solution containing low-melting-point metal ions for electroplating treatment.

[0077] The low-melting-point metal ions are selectively deposited in the area to be welded to prepare a low-melting-point metal coating, thereby obtaining the intermediate-state coated electrode sheet of the target battery.

[0078] The intermediate-state coated electrode sheet is planarized to obtain the low-melting-point metal electrode sheet of the target battery.

[0079] The clean electrode sheet is placed in a solution containing an activator. The activator reacts chemically with the surface of the area to be welded on the clean electrode sheet, removing residual trace oxide film and adsorbed impurities. At the same time, it activates the surface atomic activity, enhancing the adsorption and deposition capacity of low-melting-point metal ions during subsequent electroplating. After the treatment is completed, the electrode sheet is removed and rinsed with deionized water to obtain the activated clean electrode sheet of the target battery. The data of the activated clean electrode sheet comes from the clean electrode sheet after activation treatment.

[0080] A photoresist resistant to high temperature and electroplating solution corrosion was selected as the mask material. The photoresist was evenly applied to the non-welding area of ​​the activated and cleaned electrode sheet using a coating equipment. During the coating process, it was ensured that the photoresist completely covered the non-welding area and did not overflow into the area to be welded. Subsequently, the coated electrode sheet was baked and cured to make the photoresist tightly bonded to the non-welding area of ​​the electrode sheet, forming a strong mask layer, thus obtaining the mask-protected electrode sheet of the target battery. The data source of this mask-protected electrode sheet is the activated and cleaned electrode sheet after the mask layer was applied.

[0081] Prepare an electroplating solution containing low-melting-point metal ions, ensuring that the concentration of low-melting-point metal ions in the solution is uniform and meets the deposition requirements. Fix the mask-protected electrode sheet on the electroplating fixture as the cathode, and select a metal plate of the same material as the low-melting-point metal as the anode. Connect the cathode and anode to the corresponding interfaces of the electroplating power supply, and then immerse both of them in the electroplating solution, ensuring that the area to be welded is completely submerged in the electroplating solution and that the mask layer does not contact the power supply interface, thus preparing for the electroplating process.

[0082] When the electroplating power supply is turned on, the low-melting-point metal ions in the electroplating solution move towards the mask protection electrode sheet, which serves as the cathode, under the action of the electric field force. Since the non-welding area is blocked by the mask layer, the low-melting-point metal ions cannot be deposited in the area. They can only selectively accumulate on the surface of the exposed area to be welded and gain electrons, which are reduced to metal atoms and deposited layer by layer to form a uniform and continuous low-melting-point metal coating. After the deposition is completed, the power supply is turned off, and the electrode sheet is removed to obtain the intermediate-state coated electrode sheet of the target battery. The data source of this intermediate-state coated electrode sheet is the mask protection electrode sheet with a low-melting-point metal coating after electroplating.

[0083] The intermediate-state coated electrode sheet is placed in a precision grinding equipment, and diamond grinding paste is used as the grinding medium. The equipment is adjusted so that the grinding head acts on the surface of the low-melting-point metal coating with constant pressure and speed. Through the relative friction between the grinding head and the coating surface, irregular structures such as protrusions and burrs on the coating surface are removed, making the coating surface flat and smooth, while ensuring that the coating thickness is uniform. After grinding, the electrode sheet is rinsed with deionized water and dried to obtain the low-melting-point metal electrode sheet of the target battery. The data source of this low-melting-point metal electrode sheet is the intermediate-state coated electrode sheet after planarization treatment.

[0084] The beneficial effects are that electroplating surface activation of the clean electrode sheet to be welded area effectively removes residual oxide film and adsorbed impurities, activates surface atomic activity, and creates favorable conditions for the adsorption and deposition of low melting point metal ions, resulting in an activated clean electrode sheet suitable for electroplating.

[0085] Applying a mask layer to non-welding areas forms a mask to protect the electrode sheet, precisely isolating non-target areas and preventing low-melting-point metal ions from depositing in irrelevant parts, thus ensuring the selectivity and targeting of electroplating.

[0086] Electroplating is performed using a mask-protected electrode sheet as the cathode, which allows low-melting-point metal ions to be directionally deposited on the area to be welded under the action of an electric field, forming a uniform and continuous low-melting-point metal coating, thus obtaining an intermediate-state coated electrode sheet.

[0087] By removing defects such as protrusions and burrs from the coating surface through leveling treatment, the coating thickness becomes uniform and the surface becomes smooth, ultimately resulting in a low-melting-point metal electrode sheet. This provides a high-quality coating base for metallurgical bonding during subsequent welding, thereby improving the bonding strength and stability of the welding interface.

[0088] The alignment and integration module is used to align and stack the clean electrode tab with the low melting point metal electrode sheet to obtain the stack of the target battery.

[0089] In this embodiment, when the alignment and integration module performs the alignment and stacking of the clean electrode tab and the low-melting-point metal electrode sheet to obtain the composite of the target battery, it is specifically used for:

[0090] Visual information is used to locate the clean electrode tab and the low-melting-point metal electrode sheet to determine the relative position information of the target battery.

[0091] Based on the relative position information, the spatial positional relationship between the clean electrode tab and the low melting point metal electrode sheet is adjusted to obtain the alignment electrode tab and alignment electrode sheet of the target battery.

[0092] The opposing tabs and opposing electrode sheets are stacked to obtain a temporary fixing assembly for the target battery.

[0093] The temporary fixing component is pre-pressed and bonded to obtain the stacked body of the target battery.

[0094] The visual positioning device, which includes a high-definition industrial camera and an image acquisition system, is activated. The clean electrode tab and the low-melting-point metal electrode sheet are fixed at designated positions on the positioning platform, ensuring that the welding areas of both are completely within the camera's field of view. The camera captures and acquires feature images of the welding area of ​​the clean electrode tab and the welding area of ​​the low-melting-point metal electrode sheet. By comparing the images, key feature points of the two areas are identified, thereby determining the positional relationship between the clean electrode tab and the low-melting-point metal electrode sheet in the plane and space, and obtaining the relative positional information of the target battery. The data source for this relative positional information is the analysis results of the feature images of the two components by the visual positioning device.

[0095] Based on the obtained relative position information, the precision drive mechanism of the positioning platform is activated. This mechanism adjusts the spatial position of the clean electrode tab through mechanical transmission, so that the welding area of ​​the clean electrode tab and the welding area of ​​the low melting point metal electrode sheet are completely aligned in the horizontal direction. At the same time, the height difference between the two is adjusted to ensure that the welding area can be accurately attached when stacked. During the adjustment process, the position information is fed back in real time through the visual positioning device until the preset alignment accuracy requirements are met, and the aligned electrode tab and aligned electrode sheet of the target battery are obtained. The data source of the aligned electrode tab and aligned electrode sheet is the clean electrode tab and low melting point metal electrode sheet after the position adjustment.

[0096] Keeping the relative positions of the alignment tab and the alignment electrode sheet unchanged, the alignment tab is slowly moved above the area to be welded on the alignment electrode sheet by a mechanical handling device, so that the welding area of ​​the alignment tab and the low melting point metal plating area of ​​the alignment electrode sheet are completely overlapped. The alignment tab is then smoothly placed down so that it naturally overlaps with the alignment electrode sheet to form an unfixed assembly structure, thus obtaining a temporary fixing component for the target battery. The data source for this temporary fixing component is the result of the stacking of the alignment tab and the alignment electrode sheet.

[0097] The temporary fixing component is placed into the pressing mold of the pre-pressing equipment. The pressing surface of the mold is perfectly matched with the shape of the overlapping area of ​​the component. The pre-pressing equipment is started, and the equipment applies constant pressure to the temporary fixing component through hydraulic transmission, so that the welding area of ​​the alignment tab and the alignment electrode sheet is tightly attached. At the same time, the pressure is maintained for a period of time to allow the low melting point metal plating layer to form a preliminary physical bond with the tab surface, so as to avoid positional displacement in subsequent processing. After the pre-pressing is completed, the component is removed to obtain the stack of the target battery. The data of the stack comes from the temporary fixing component after the pre-pressing and bonding treatment.

[0098] The beneficial effect is that the relative position information of the clean electrode tab and the low melting point metal electrode sheet can be accurately obtained through visual information positioning, providing accurate data for subsequent alignment adjustment and ensuring the accuracy of position matching.

[0099] The spatial relationship between the two is adjusted based on the relative position information to ensure precise alignment of the welding areas of the tab and the electrode sheet, resulting in aligned tabs and aligned electrode sheets, thus avoiding bonding defects caused by welding area misalignment.

[0100] The aligned tabs and electrode sheets are stacked to form a temporary fixing assembly, laying the foundation for pre-pressing and bonding, and ensuring the continuity of subsequent processing.

[0101] Pre-pressing bonding process ensures that the welding areas of the temporary fixing components are tightly bonded, forming a stable composite, which enhances heat transfer and metal wetting during subsequent welding, and improves the bonding quality and stability of the welding interface.

[0102] The mutual welding module is used to apply pressure to the composite and heat it to above the melting point of the low melting point metal coating, so that the molten low melting point metal spreads and wets the clean electrode surface under pressure, forming a metallurgical bonding interface, and obtaining the welding assembly of the target battery.

[0103] In this embodiment, when the mutual welding module applies pressure to the laminate and heats it above the melting point of the low-melting-point metal coating, causing the molten low-melting-point metal to spread and wet the clean electrode surface under pressure, forming a metallurgical bonding interface to obtain the welding assembly of the target battery, it is specifically used for:

[0104] The composite is placed between the lower and upper pressure heads at the welding station, with the upper pressure head in contact with the upper surface of the composite and the lower pressure head in contact with the lower surface of the composite, to obtain the composite to be heated for the target battery.

[0105] An initial welding pressure is applied to the composite to be heated using the upper and lower pressure heads, so that the clean tabs and the low-melting-point metal electrode sheet are tightly bonded under pressure, thus obtaining the pre-compressed composite of the target battery.

[0106] While maintaining the initial welding pressure, the pre-compressed composite is heated by the heating elements in the upper and lower pressure heads;

[0107] The temperature of the pre-compressed composite is raised above the melting point of the low-melting-point metal coating, causing the low-melting-point metal coating to melt, thereby obtaining the molten metal intermediate of the target battery;

[0108] After the low-melting-point metal coating melts, adjust the pressure applied by the upper pressure head and the lower pressure head to the welding pressure;

[0109] The molten low-melting-point metal is spread outwards under the welding pressure and wets the surface of the clean electrode tab, forming an intermetallic compound bonding layer, thus obtaining the welded assembly of the target battery.

[0110] When the mutual welding module raises the temperature of the pre-compressed laminate to above the melting point of the low-melting-point metal coating, thereby melting the low-melting-point metal coating and obtaining the molten metal intermediate of the target battery, it is specifically used for:

[0111] Set the target heating temperature of the heating element, which is higher than the melting point of the low-melting-point metal coating, and determine the heating process parameters of the target battery;

[0112] Based on the heating process parameters, the pre-compressed composite is heated in stages, so that the pre-compressed composite sequentially undergoes a preheating stage and a melting stage.

[0113] In the preheating stage, the pre-compressed composite is heated to a preheating temperature below the melting point of the low-melting-point metal coating at the first heating rate of the heating process parameters, to obtain the preheated composite of the target battery.

[0114] During the melting stage, the preheated composite is heated from the preheating temperature to the target heating temperature at the second heating rate of the heating process parameters to obtain the melted composite of the target battery.

[0115] The molten composite is subjected to heat preservation treatment to obtain the target battery molten metal intermediate.

[0116] The composite is placed smoothly between the lower and upper pressure heads at the welding station, ensuring that the overlapping area of ​​the composite is aligned with the center of the upper and lower pressure heads. The height of the upper pressure head is slowly adjusted so that the pressing surface of the upper pressure head is in complete contact with the upper surface of the composite. At the same time, the supporting surface of the lower pressure head is tightly fitted with the lower surface of the composite without gaps or offset, thus obtaining the composite to be heated for the target battery. The data source for this composite is the composite placed between the upper and lower pressure heads and with the contact surfaces in contact.

[0117] The pressure drive system of the welding equipment is activated, and the upper pressure head is driven downward and the lower pressure head is driven upward simultaneously through mechanical transmission to apply initial welding pressure to the stack to be heated. This pressure can eliminate the tiny gaps inside the stack, so that the welding area of ​​the clean electrode tab and the low melting point metal electrode sheet is tightly attached under the pressure. This ensures that heat can be efficiently transferred during subsequent heating and that the molten metal can fully contact the two welding surfaces, resulting in a pre-compressed stack of the target battery. The data source for this pre-compressed stack is the stack to be heated after the initial welding pressure.

[0118] Maintaining the initial welding pressure, activate the built-in heating elements inside the upper and lower pressure heads. The heating elements convert electrical energy into heat energy, which is then evenly transferred to the pressing and supporting surfaces of the upper and lower pressure heads. The heat is then transferred to the pre-compressed composite body through heat conduction. The heat penetrates from the upper and lower surfaces of the composite body into the internal welding area, causing the temperature of the welding area to gradually increase. Throughout the heating process, the initial welding pressure is maintained to prevent the composite body from loosening or shifting position.

[0119] The pre-compressed composite is continuously heated until the temperature of the welding area of ​​the composite is confirmed by the temperature monitoring device to rise above the melting point of the low-melting-point metal coating. At this time, the low-melting-point metal coating absorbs enough heat and changes from solid to liquid. The liquid metal fills the gap between the clean electrode tab and the low-melting-point metal electrode sheet, forming a uniform molten metal layer, thus obtaining the molten metal intermediate of the target battery. The data source of this molten metal intermediate is the pre-compressed composite with a temperature above the melting point of the low-melting-point metal coating.

[0120] After confirming that the low-melting-point metal coating has completely melted, the pressure applied by the upper and lower pressure heads is adjusted through the pressure regulation system of the welding equipment to adjust the initial welding pressure to the welding pressure. This welding pressure is greater than the initial welding pressure, which can provide sufficient driving force for the molten low-melting-point metal, while avoiding excessive pressure that could cause deformation of the electrode sheet or tab. The pressure adjustment process is carried out smoothly to ensure that the molten metal intermediate will not splash or shift due to sudden pressure changes.

[0121] Under continuous welding pressure, the molten low-melting-point metal spreads evenly around, completely covering the welding area of ​​the clean electrode tab and the low-melting-point metal electrode sheet. The liquid metal fully contacts and wets the surface of the clean electrode tab, forming an intermetallic compound bonding layer through atomic diffusion. This bonding layer enables the clean electrode tab and the low-melting-point metal electrode sheet to form a strong metallurgical bonding interface. After the temperature cools naturally, the molten metal solidifies, resulting in the welding assembly of the target battery. The data source for this welding assembly is the molten metal intermediate that has been spread under pressure, wetted, and forms a metallurgical bonding interface.

[0122] First, the inherent melting point of the low-melting-point metal coating is determined. Then, the target heating temperature of the heating element is set in combination with the welding process requirements and the thermal conductivity of the composite. This target heating temperature is higher than the melting point of the low-melting-point metal coating. At the same time, key information such as the heating rate and the temperature holding time at each stage are determined. This information is integrated to form the heating process parameters of the target battery. The data source for these heating process parameters is the setting and derivation results based on the characteristics of the low-melting-point metal coating and the welding requirements.

[0123] The heating elements are started according to the determined heating process parameters, and the pre-compressed composite is heated in stages. The entire heating process strictly follows the order of the preheating stage and the melting stage to gradually advance, so as to avoid the thermal stress inside the composite or the uneven melting of the low melting point metal coating caused by a sudden temperature rise, and to ensure that the heating process is stable and controllable, laying the foundation for the heating of subsequent stages.

[0124] During the preheating stage, the heating power of the heating element is strictly controlled according to the first heating rate set in the heating process parameters. Heat is uniformly transferred to the pre-compressed composite through heat conduction, so that the temperature of the composite gradually increases from room temperature until it reaches the preset preheating temperature. This preheating temperature is lower than the melting point of the low-melting-point metal coating. This process can eliminate the temperature gradient inside the composite and reduce the thermal shock in the subsequent melting stage, thus obtaining the preheated composite of the target battery. The data source of this preheated composite is the pre-compressed composite heated to the preheating temperature at the first heating rate.

[0125] After entering the melting stage, the process switches to the second heating rate set in the heating process parameters and continues to heat the preheated composite through the heating element. The second heating rate is adapted to the melting characteristics of the low melting point metal coating, ensuring that heat can penetrate into the coating area quickly and evenly, so that the temperature of the preheated composite continues to rise from the preheating temperature until it reaches the preset target heating temperature. At this time, the low melting point metal coating begins to melt, and the melted composite of the target battery is obtained. The data source of this melted composite is the preheated composite heated to the target heating temperature by the second heating rate.

[0126] The output power of the heating element is kept stable, and the molten composite is kept at the target heating temperature for a period of time. During the heat preservation process, heat is continuously transferred to ensure that the low melting point metal coating is completely melted and the molten state is uniform. At the same time, the temperature of each part of the composite is kept consistent to avoid local unmelted or overheating. After the heat preservation treatment, the molten metal intermediate of the target battery is obtained. The data of the molten metal intermediate comes from the molten composite after the heat preservation treatment.

[0127] The beneficial effect is that the composite is precisely placed between the upper and lower pressure heads and fully contacted, providing a stable foundation for subsequent pressure application and heat transfer, ensuring uniform stress and heating, and obtaining the composite to be heated.

[0128] Applying initial welding pressure ensures that the clean electrode tabs and the low-melting-point metal electrode sheet are tightly bonded, eliminating gap interference and creating good contact conditions for molten metal wetting, thus forming a pre-compressed composite.

[0129] Heating is achieved by maintaining pressure through heating elements, ensuring that pressure and temperature work together to prevent components from becoming loose or uneven heat transfer, and ensuring that the low-melting-point metal coating is heated evenly.

[0130] The temperature is raised above the melting point of the coating to completely melt it, forming a molten metal intermediate, which provides sufficient liquid metal raw materials for subsequent spreading and metallurgical bonding.

[0131] After the coating melts, the welding pressure is adjusted to provide sufficient driving force for the molten metal to spread, while avoiding excessive pressure that could damage the substrate.

[0132] Molten metal spreads evenly under pressure and fully wets the clean electrode surface, forming a strong intermetallic compound bonding layer through atomic diffusion, thus constructing a stable metallurgical bonding interface and ultimately obtaining a welded assembly with high welding quality and reliable structure.

[0133] Setting a target heating temperature higher than the melting point of low-melting-point metal coatings and determining heating process parameters provides a clear and precise basis for segmented heating, ensuring that the heating process is controllable.

[0134] The segmented heating mode is adopted, so that the pre-compressed composite material goes through the preheating and melting stages in sequence, avoiding thermal stress damage caused by sudden temperature rise and ensuring the structural integrity of the component.

[0135] During the preheating stage, the material is heated to a preheating temperature below the melting point at the first heating rate, which effectively eliminates the internal temperature gradient of the component and lays the foundation for subsequent uniform melting, resulting in a preheated composite.

[0136] During the melting stage, the temperature is increased to the target temperature at a second heating rate to match the melting characteristics of the coating, ensuring that the low-melting-point metal coating melts quickly and uniformly to form a molten composite.

[0137] The molten composite is heat-insulated to ensure that the coating is completely melted and in a stable molten state, avoiding local unmelted areas, and finally obtaining a uniform and reliable molten metal intermediate, providing a high-quality raw material guarantee for subsequent metallurgical bonding.

[0138] The low-temperature pressure holding module is used to maintain pressure and cool the welding assembly to obtain the solidified assembly of the target battery;

[0139] In this embodiment, when the cryogenic pressure holding module performs pressure holding and cooling on the welding assembly to obtain the solidified assembly of the target battery, it is specifically used for:

[0140] While maintaining the welding pressure, the upper pressure head and the lower pressure head are used to apply continuous pressure to the welding assembly to obtain the pressure-holding welding assembly of the target battery.

[0141] The pressure-holding welding assembly is cooled to obtain the cooled welding assembly of the target battery.

[0142] When the temperature of the cooling welding assembly drops below the solidification point of the low-melting-point metal coating, a preliminary solidified welding assembly of the target battery is obtained.

[0143] Release the pressure of the upper and lower pressure heads on the pre-cured welding assembly to obtain the solidified assembly of the target battery.

[0144] Maintaining a constant welding pressure applied by the mutual welding modules, the upper and lower pressure heads continuously apply uniform and stable pressure to the welding assembly. This pressure prevents shrinkage pores or separation of the bonding surface in the solidifying low-melting-point metal after melting, ensuring that the metallurgical bonding interface between the clean electrode tab and the low-melting-point metal electrode sheet remains tightly adhered during solidification, thus obtaining the pressure-holding welding assembly of the target battery. The data source for this pressure-holding welding assembly is the welding assembly that continuously withstands welding pressure.

[0145] The heating elements inside the upper and lower pressure heads are turned off, and the cooling system of the welding equipment is started. The cooling system exchanges heat with the upper and lower pressure heads through circulating cooling medium, quickly removing the heat from the upper and lower pressure heads. Then, the heat of the pressure-holding welding assembly is transferred to the cooling medium through heat conduction, so that the temperature of the pressure-holding welding assembly gradually decreases from the target heating temperature. The welding pressure remains constant throughout the cooling process to prevent the assembly from deforming due to temperature changes and pressure fluctuations. The cooled welding assembly of the target battery is obtained. The data source of this cooled welding assembly is the pressure-holding welding assembly after cooling treatment by the cooling system.

[0146] The temperature change of the cooling welding assembly is continuously monitored in real time by a temperature monitoring device. As the cooling system continues to work, the temperature of the cooling welding assembly continues to decrease. When the temperature monitoring device shows that the assembly temperature drops below the solidification point of the low-melting-point metal coating, the low-melting-point metal, which was originally in a molten state, completely solidifies, and a strong solid connection is formed at the metallurgical bonding interface. At this time, the clean electrode tab and the low-melting-point metal electrode sheet have been stably bonded, and the preliminary solidified welding assembly of the target battery is obtained. The data source of this preliminary solidified welding assembly is the cooling welding assembly whose temperature drops below the solidification point.

[0147] The pressure release mechanism of the welding equipment is activated. The upper pressure head moves upward and the lower pressure head moves downward through mechanical transmission control, gradually releasing the welding pressure applied to the pre-cured welding assembly. The pressure release process is smooth and slow to avoid instantaneous pressure release that could cause stress inside the assembly or loosening of the joint surface. After complete pressure release, the assembly is removed from the welding station to obtain the solidified assembly of the target battery. The data source for this solidified assembly is the pre-cured welding assembly after pressure release.

[0148] The beneficial effect is that by maintaining the welding pressure and continuously holding the pressure through the upper and lower pressure heads, shrinkage pores or separation of the bonding surface can be prevented when low-melting-point metals solidify, ensuring that the metallurgical bonding interface is tightly fitted and forming a pressure-holding welded assembly.

[0149] The pressure-holding welded assembly is cooled down to allow the molten metal to cool gradually, avoiding sudden temperature drops that could cause deformation or stress concentration in the assembly, resulting in a cooled welded assembly.

[0150] When the temperature drops below the freezing point, the molten metal completely solidifies, and a strong solid connection is formed at the metallurgical interface, ensuring a stable bond between the tab and the electrode sheet, resulting in a pre-cured welded assembly.

[0151] Smoothly releasing the pressure avoids internal stress or loosening of the joint surface caused by sudden pressure relief, ultimately resulting in a structurally stable and reliably welded consolidation assembly, laying a good foundation for subsequent shaping processes.

[0152] The shaping and trimming module is used to shape the solidified component to obtain the target weldment of the target battery.

[0153] In this embodiment, when the shaping and trimming module performs shaping processing on the consolidation assembly to obtain the target weldment of the target battery, it is specifically used for:

[0154] The outline dimensions and morphological features of the consolidated component are compared one by one with the preset standard welded part model to determine the area to be shaped and the amount of shaping of the consolidated component.

[0155] Based on the area to be shaped and the shaping amount, the excess portion of the edge of the solidification component is trimmed to obtain the trimmed solidification component of the target battery.

[0156] The cut and consolidated assembly is flattened to obtain a flat and consolidated assembly of the target battery.

[0157] The surface of the flattened and consolidated assembly is cleaned to obtain the target weldment of the target battery.

[0158] When the shaping and trimming module performs trimming of the excess edge portion of the bonding assembly based on the area to be shaped and the shaping amount to obtain the trimmed bonding assembly of the target battery, it is specifically used for:

[0159] Based on the area to be shaped and the shaping amount, the cutting path parameters of the consolidation component are generated;

[0160] Based on the cutting path parameters, the excess portion of the edge of the solidified component is removed to obtain the preliminary cut component of the target battery.

[0161] The cut edges of the initial cutting assembly are trimmed to obtain the cut and bonded assembly of the target battery.

[0162] High-precision visual scanning equipment and dimensional measurement tools are used to comprehensively scan and measure the solidified assembly to obtain its actual contour size information and surface morphology features. This actual information is compared one by one with the preset standard welded part model, focusing on checking key indicators such as contour boundaries, weld area flatness, and overall size. The edge protrusions and dimensional over-standard parts in the solidified assembly that exceed the standard range are identified as areas that need to be shaped. At the same time, the amount of material to be removed or the flatness parameters to be adjusted for each area to be shaped are determined, resulting in the area to be shaped and the amount of shaping for the target battery. The data for the area to be shaped and the amount of shaping are obtained from the comparison results between the actual information of the solidified assembly and the standard welded part model.

[0163] Based on the determined area to be shaped and the amount to be shaped, the solidified assembly is fixed on the worktable of the precision cutting equipment, ensuring that the excess part of the edge to be cut is fully exposed within the working range of the cutting tool. The cutting path of the cutting equipment is adjusted to precisely fit the boundary of the area to be shaped. After the equipment is started, the cutting tool moves smoothly along the preset path, cutting away the excess material at the edge of the solidified assembly in one go. During the cutting process, damage to the welding area and the main structure is avoided, ensuring that the outline of the cut assembly meets the dimensional requirements of the standard welded part model, thus obtaining the cut solidified assembly of the target battery. The data source for this cut solidified assembly is the solidified assembly after the cutting process.

[0164] The cut and bonded assembly is placed on the flat working surface of the flattening equipment. The flattening mold of the equipment is adjusted to match the surface shape of the cut and bonded assembly. The flattening equipment is started, and the flattening mold applies constant pressure evenly to the surface of the cut and bonded assembly. The focus is on flattening any small protrusions or uneven areas that may exist around the welding area. The pressure makes the surface of the assembly flat and smooth, while maintaining the structural stability of the welding area. After flattening, the assembly is removed, and the flattened and bonded assembly of the target battery is obtained. The data of this flattened and bonded assembly comes from the cut and bonded assembly after flattening.

[0165] The surface of the flat and solidified assembly is cleaned using a high-pressure gas purging device and a lint-free wiping cloth. First, the surface of the assembly is purged with high-pressure gas to remove dust, debris and other impurities generated during the cutting and flattening process. Then, the surface of the assembly is gently wiped with a lint-free wiping cloth dampened with a special cleaning agent to remove residual oil and micro-stains. During the wiping process, avoid rubbing the welding area vigorously to prevent damage to the metallurgical bonding interface. After cleaning, the surface of the assembly is dried with a dry lint-free cloth to obtain the target welded part of the target battery. The data for this target welded part comes from the flat and solidified assembly after surface cleaning.

[0166] Based on the determined area to be shaped and the amount to be shaped, combined with the overall outline of the consolidation component and the location of the welding area, the starting point, ending point, and direction of the intermediate path of the cutting are determined to ensure that the cutting path can accurately avoid the welding area and the effective structure of the main body, and only cover the excess parts of the edge. At the same time, the cutting depth and width are determined according to the amount to be shaped. Integrating this information forms the cutting path parameters of the consolidation component. The data source of these cutting path parameters is the derivation result of the combination of the area to be shaped, the amount to be shaped, and the structural features of the consolidation component.

[0167] The consolidation component is fixed on a special fixture of the CNC cutting equipment. The cutting path parameters are input into the control system through the equipment's import function. The control system drives the cutting tool to move according to the parameter instructions. The cutting tool precisely removes the excess part of the edge of the consolidation component according to the preset path and cutting amount. During the cutting process, the tool maintains a stable movement speed and cutting force to avoid burrs, chipping, or damage to the main body of the component. After the cutting is completed, a preliminary cut component of the target battery is obtained. The data source of this preliminary cut component is the consolidation component after the excess part of the edge has been removed under the guidance of the cutting path parameters.

[0168] Using a fine trimming tool, the edges of the initially cut component are polished segment by segment. During polishing, the tool is kept at a constant angle to the cut edge. The burrs, sharp edges and uneven marks remaining after cutting are gently removed to make the cut edge smooth and regular. At the same time, it is ensured that the trimming process does not change the preset outline size and welding area structure of the component. After the trimming is completed, the cut and bonded component of the target battery is obtained. The data of the cut and bonded component comes from the initially cut component after the trimming process.

[0169] The beneficial effect is that by comparing it one by one with the standard welded part model, the area to be shaped and the amount of shaping of the solidified component can be accurately located, providing a clear basis for subsequent shaping and ensuring that the shaping is targeted.

[0170] Based on the area to be shaped and the amount to be shaped, the excess parts of the edge are trimmed, the dimensional deviations are corrected, and the component outline is made to meet the standard, resulting in a trimmed and fixed component.

[0171] The cut and consolidated components are flattened to eliminate surface protrusions, unevenness and other defects, improve the surface flatness of the components and form flat consolidated components.

[0172] By cleaning the surface to remove impurities and stains generated during the cutting and flattening process, the performance of the welded parts is prevented from being affected by impurities. The final result is a target welded part with a neat appearance, accurate dimensions, and reliable performance, which meets the requirements for use in lithium-ion batteries.

[0173] Based on the area to be reshaped and the amount of reshaping, precise cutting path parameters are generated, providing a clear and controllable execution basis for the removal of excess parts at the edges, ensuring the targeting and accuracy of the cutting.

[0174] Based on the cutting path parameters, excess parts of the edges are removed, and the dimensional deviations of the solidified components are precisely corrected so that the component outline conforms to the standard requirements, resulting in the preliminary cut component.

[0175] The edges of the pre-cut components are trimmed to remove burrs, sharp corners, and uneven surfaces left over from the cutting process, resulting in smooth and regular edges. This process produces a cut and bonded component with precise contours and regular edges, laying a good foundation for subsequent flattening and cleaning, and improving the appearance and structural reliability of the target welded parts.

[0176] This invention provides a lithium-ion battery electrode tab welding device, which can achieve high-precision circular forming of magnetic components, improve the accuracy and structural stability of the finished product, and has high reliability.

[0177] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0178] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A lithium-ion battery electrode tab welding device, characterized in that, The device includes a pretreatment module, a low-temperature electroplating module, an alignment and integration module, a welding module, a low-temperature pressure holding module, and a shaping and trimming module, wherein: The pretreatment module is used to perform surface pretreatment on the electrode sheet welding area and the tab welding area of ​​the target battery to obtain clean electrode sheets and clean tabs of the target battery. The low-temperature electroplating module is used to prepare a low-melting-point metal coating on the surface of the area to be welded of the clean electrode sheet based on a selective electroplating process, thereby obtaining the low-melting-point metal electrode sheet of the target battery. The alignment and integration module is used to align and stack the clean electrode tab with the low melting point metal electrode sheet to obtain the stack of the target battery. The mutual welding module is used to apply pressure to the composite and heat it to above the melting point of the low melting point metal coating, so that the molten low melting point metal spreads and wets the clean electrode surface under pressure, forming a metallurgical bonding interface, and obtaining the welding assembly of the target battery. The low-temperature pressure holding module is used to maintain pressure and cool the welding assembly to obtain the solidified assembly of the target battery; The shaping and trimming module is used to shape the solidified component to obtain the target weldment of the target battery.

2. The lithium-ion battery electrode tab welding device according to claim 1, characterized in that, The pretreatment module, when performing surface pretreatment on the electrode sheet welding area and the tab welding area of ​​the target battery to obtain clean electrode sheets and clean tabs of the target battery, is specifically used for: The electrode welding area of ​​the target battery is bombarded to obtain a clean electrode welding area of ​​the target battery. Laser scanning is performed on the tab welding area of ​​the target battery to obtain a clean tab welding area of ​​the target battery; The clean electrode sheet welding area and the clean electrode tab welding area are subjected to vacuum drying treatment to obtain the clean electrode sheet and clean electrode tab of the target battery.

3. The lithium-ion battery electrode tab welding device according to claim 1, characterized in that, When the low-temperature electroplating module performs a selective electroplating process to prepare a low-melting-point metal coating on the surface of the area to be welded on the clean electrode sheet, thereby obtaining the low-melting-point metal electrode sheet of the target battery, it is specifically used for: Electroplating is performed on the area to be welded of the clean electrode sheet to activate the surface and obtain the activated clean electrode sheet of the target battery. A mask layer is applied to the non-welding area on the activated clean electrode sheet, excluding the area to be welded, to obtain the mask-protected electrode sheet of the target battery; The mask protection electrode sheet is placed as the cathode in an electroplating solution containing low-melting-point metal ions for electroplating treatment. The low-melting-point metal ions are selectively deposited in the area to be welded to prepare a low-melting-point metal coating, thereby obtaining the intermediate-state coated electrode sheet of the target battery. The intermediate-state coated electrode sheet is planarized to obtain the low-melting-point metal electrode sheet of the target battery.

4. The lithium-ion battery electrode tab welding device according to claim 1, characterized in that, When the alignment and integration module performs the alignment and stacking of the clean electrode tab and the low-melting-point metal electrode sheet to obtain the composite of the target battery, it is specifically used for: Visual information is used to locate the clean electrode tab and the low-melting-point metal electrode sheet to determine the relative position information of the target battery. Based on the relative position information, the spatial positional relationship between the clean electrode tab and the low melting point metal electrode sheet is adjusted to obtain the alignment electrode tab and alignment electrode sheet of the target battery. The opposing tabs and opposing electrode sheets are stacked to obtain a temporary fixing assembly for the target battery. The temporary fixing component is pre-pressed and bonded to obtain the stacked body of the target battery.

5. The lithium-ion battery electrode tab welding device according to claim 1, characterized in that, The mutual welding module, when applying pressure to the laminate and heating it above the melting point of the low-melting-point metal coating, causing the molten low-melting-point metal to spread and wet the clean electrode surface under pressure, forming a metallurgical bonding interface, and obtaining the welding assembly of the target battery, is specifically used for: The composite is placed between the lower and upper pressure heads at the welding station, with the upper pressure head in contact with the upper surface of the composite and the lower pressure head in contact with the lower surface of the composite, to obtain the composite to be heated for the target battery. An initial welding pressure is applied to the composite to be heated using the upper and lower pressure heads, so that the clean tabs and the low-melting-point metal electrode sheet are tightly bonded under pressure, thus obtaining the pre-compressed composite of the target battery. While maintaining the initial welding pressure, the pre-compressed composite is heated by the heating elements in the upper and lower pressure heads; The temperature of the pre-compressed composite is raised above the melting point of the low-melting-point metal coating, causing the low-melting-point metal coating to melt, thereby obtaining the molten metal intermediate of the target battery; After the low-melting-point metal coating melts, adjust the pressure applied by the upper pressure head and the lower pressure head to the welding pressure; The molten low-melting-point metal is spread outwards under the welding pressure and wets the surface of the clean electrode tab, forming an intermetallic compound bonding layer, thus obtaining the welded assembly of the target battery.

6. The lithium-ion battery electrode tab welding device according to claim 5, characterized in that, When the mutual welding module raises the temperature of the pre-compressed laminate to above the melting point of the low-melting-point metal coating, thereby melting the low-melting-point metal coating and obtaining the molten metal intermediate of the target battery, it is specifically used for: Set the target heating temperature of the heating element, which is higher than the melting point of the low-melting-point metal coating, and determine the heating process parameters of the target battery; Based on the heating process parameters, the pre-compressed composite is heated in stages, so that the pre-compressed composite sequentially undergoes a preheating stage and a melting stage. In the preheating stage, the pre-compressed composite is heated to a preheating temperature below the melting point of the low-melting-point metal coating at the first heating rate of the heating process parameters, to obtain the preheated composite of the target battery. During the melting stage, the preheated composite is heated from the preheating temperature to the target heating temperature at the second heating rate of the heating process parameters to obtain the melted composite of the target battery. The molten composite is subjected to heat preservation treatment to obtain the target battery molten metal intermediate.

7. The lithium-ion battery electrode tab welding device according to claim 6, characterized in that, When the cryogenic pressure holding module performs pressure holding and cooling on the welding assembly to obtain the solidified assembly of the target battery, it is specifically used for: While maintaining the welding pressure, the upper pressure head and the lower pressure head are used to apply continuous pressure to the welding assembly to obtain the pressure-holding welding assembly of the target battery. The pressure-holding welding assembly is cooled to obtain the cooled welding assembly of the target battery. When the temperature of the cooling welding assembly drops below the solidification point of the low-melting-point metal coating, a preliminary solidified welding assembly of the target battery is obtained. Release the pressure of the upper and lower pressure heads on the pre-cured welding assembly to obtain the solidified assembly of the target battery.

8. The lithium-ion battery electrode tab welding device according to claim 1, characterized in that, When the shaping and trimming module performs shaping processing on the solidified assembly to obtain the target weldment of the target battery, it is specifically used for: The outline dimensions and morphological features of the consolidated component are compared one by one with the preset standard welded part model to determine the area to be shaped and the amount of shaping of the consolidated component. Based on the area to be shaped and the shaping amount, the excess portion of the edge of the solidification component is trimmed to obtain the trimmed solidification component of the target battery. The cut and consolidated assembly is flattened to obtain a flat and consolidated assembly of the target battery. The surface of the flattened and consolidated assembly is cleaned to obtain the target weldment of the target battery.

9. A lithium-ion battery electrode tab welding device according to claim 8, characterized in that, When the shaping and trimming module performs trimming of the excess edge portion of the bonding assembly based on the area to be shaped and the shaping amount to obtain the trimmed bonding assembly of the target battery, it is specifically used for: Based on the area to be shaped and the shaping amount, the cutting path parameters of the consolidation component are generated; Based on the cutting path parameters, the excess portion of the edge of the solidified component is removed to obtain the preliminary cut component of the target battery. The cut edges of the initial cutting assembly are trimmed to obtain the cut and bonded assembly of the target battery.

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