Local vacuum laser welding device and method for battery

Abstract

The invention discloses a local vacuum laser welding device and method for batteries, which are used for laser welding of battery connecting pieces and comprise a laser beam guiding assembly. The laser beam guiding assembly comprises a connecting base and a cone part, a sealing protection lens is arranged in the connecting base, the cone part is connected with the connecting base, a laser beam guiding conical cavity is formed in the cone part, and the sealing protection lens is used for forming a sealing welding space between the sealing protection lens and a welding area during welding. The minimum diameter end of the conical part is a laser beam discharge end, a plurality of through holes communicated with the laser beam guiding conical cavity are formed in the wall face of the conical part in the radial direction, and the through holes are connected to a vacuumizing pipe. Vacuum environment laser welding is adopted, the weld joint can be oxidized, the air hole defect rate is remarkably reduced, the weld joint strength and consistency are improved, and the welding quality is guaranteed; no shielding gas is needed, and production cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of battery laser welding technology, and in particular to a battery local vacuum laser welding apparatus and method. Background Technology

[0002] With the rapid development of the new energy vehicle and energy storage industries, prismatic lithium batteries have become the mainstream power batteries due to their advantages such as high energy density and structural stability. Welding of the connecting pieces is a core manufacturing process that directly determines the battery's current carrying capacity, conductivity, and consistency; therefore, improving welding quality is a core industry demand.

[0003] Currently, laser welding technology is the mainstream approach. Traditional atmospheric pressure welding exposes the weld pool to the atmosphere, where the high-temperature molten pool reacts with the air, causing oxidation and porosity. This welding environment easily leads to instability in the weld pool, resulting in issues like craters and porosity, reducing weld strength and conductivity, and causing poor weld quality and low yield. Furthermore, plasma plumes interfere with laser energy transfer, leading to poor weld formation and spatter cracks. Traditional shielding gas purging is costly, requiring regular replacement of gas cylinders, and the gas flow rate and purity both affect welding results. Dust collection pipes require specific dust collection velocities and precise placement; failure to meet these requirements also impacts welding performance. Moreover, traditional shielding gas supply methods have poor adaptability, easily wasting gas or causing defects due to insufficient protection, failing to fundamentally solve the problem. However, existing overall vacuum welding... Vacuum welding can isolate air and suppress plasma plumes, significantly improving weld quality. However, existing overall vacuum welding technology requires a large vacuum chamber, which results in bulky equipment, long vacuum establishment time, low production efficiency, and high energy and equipment costs. It cannot meet the needs of large-scale lithium battery production. In other words, batteries / modules need to be placed in a large vacuum chamber, which results in bulky equipment, slow vacuum establishment, high energy consumption, low efficiency, and high costs, making it difficult to meet the needs of large-scale production. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings and defects of existing technologies by providing a local vacuum laser welding device and method for batteries, particularly for local vacuum welding of battery connectors. It aims to solve problems such as poor welding quality under normal pressure, high efficiency and cost of overall vacuum welding, the need to purge the welding area with protective gas (N2, Ar) during the laser welding of square aluminum-shell battery connectors to prevent oxidation of the weld area, and the need for dust removal from the welding area via a dust extraction port to prevent fumes and plasma gases from blocking the laser and causing insufficient welding energy.

[0005] In one aspect, the present invention provides a battery local vacuum laser welding apparatus for laser welding of battery connectors, comprising a laser beam guiding assembly. The laser beam guiding assembly includes a connector seat having a sealing protective lens inside and a conical portion having a laser beam guiding conical cavity formed inside and connected to the connector seat. The sealing protective lens is used to form a sealed welding space between itself and the welding area during welding. The smallest diameter end of the conical portion is the laser beam discharge end. A plurality of through holes communicating with the laser beam guiding conical cavity are formed radially on the wall surface of the conical portion, and the plurality of through holes are connected to a vacuum tube.

[0006] Preferably, the maximum diameter end of the tapered portion is the laser beam entry end, the laser beam entry end is connected and fixed to the connecting seat, and the base plate of the connecting seat has an opening adapted to the laser beam entry end;

[0007] Preferably, a high-temperature resistant elastic sealing ring is embedded in the end face of the smallest diameter end of the tapered portion.

[0008] Preferably, the base plate of the connecting seat is connected to four side walls, and the four side walls are connected end to end so that the connecting seat forms a closed enclosure structure in the circumference, and an opening is formed at the top.

[0009] Preferably, the sealing protective lens is detachably arranged between the opening and the bottom plate of the connecting seat, and a sealing strip is provided on the peripheral wall of the sealing protective lens that mates with the connecting seat.

[0010] Preferably, the sealing protective lens is composed of a rectangular lens frame and a quartz glass lens defined by the lens frame surrounding its outer periphery.

[0011] Preferably, one of the sidewalls has a matching lens inlet / outlet hole, and the inner surfaces of the other sidewalls have matching limiting grooves. The lens frame cooperates with the inlet / outlet hole and the limiting groove to form a pull-out installation structure with the connecting seat.

[0012] Preferably, the lens frame has symmetrical protrusions at opposite ends, the symmetrical protrusions are arranged near the operating end of the lens frame, and the symmetrical protrusions are provided with screw holes, the axial direction of the screw holes being consistent with the pulling direction of the lens frame.

[0013] Preferably, the vacuum tube includes an annular tube, the inner wall of which has a plurality of openings adapted to the number of through holes, each of the plurality of openings communicating with the through holes through a connector, and the outer wall of the annular tube has a hole for connecting to a tube body for connecting a vacuum pump.

[0014] Preferably, an opening is provided on one side wall of the connector for connecting a gas tube to break the vacuum.

[0015] Preferably, the battery local vacuum laser welding device further includes an adjustment base plate with at least two mutually spaced adjustment elongated holes along its length. At least two of the laser beam guiding components are arranging on the adjustment base plate through the position of the connecting seat. The connecting seat is connected to the adjustment base plate by locking screws.

[0016] Another aspect of the present invention provides a battery local vacuum laser welding method, implemented using the aforementioned battery local vacuum laser welding apparatus, for laser welding of battery connecting pieces, comprising the following steps:

[0017] After the semi-finished battery cells to be welded are loaded, they are moved to the welding area;

[0018] After moving the laser beam guiding assembly above the welding area, press it down to seal the welding area;

[0019] Evacuate the sealed space in the welding area to the preset vacuum level;

[0020] The laser welder is moved to the welding area, and under preset vacuum conditions, the laser beam is guided by the laser beam guiding component to perform vacuum welding.

[0021] After welding is completed, gas is introduced into the sealed area to break the vacuum, and the laser beam guiding component is moved away from the welding area. After the welded semi-finished cell leaves the welding position, it is unloaded, and the welding is completed.

[0022] The welding technology of this invention optimizes the problems of easy oxidation of weld seams, porosity cracks, and spatter in traditional atmospheric pressure welding, thereby improving welding quality and reliability from the root. By focusing and sealing the welding area, a local vacuum environment is quickly built, avoiding the disadvantages of bulky, slow vacuum establishment, low efficiency, and high cost of overall vacuum welding equipment. It balances welding quality and production efficiency. Compared with the method of overall vacuuming in a vacuum cabinet, it is more efficient and can achieve a higher vacuum degree. Moreover, during welding, the consumption of protective gas is eliminated, and the energy consumption of dust removal equipment is also reduced, thereby reducing production energy consumption and costs and ensuring the safety and consistency of battery products. Attached Figure Description

[0023] Figure 1 This is a three-dimensional schematic diagram of the battery local vacuum laser welding device of the present invention.

[0024] Figure 2 This is a cross-sectional schematic diagram of the battery local vacuum laser welding device of the present invention.

[0025] Figure 3 This is a schematic diagram of the battery local vacuum laser welding device of the present invention being installed on a bracket for welding.

[0026] Figure 4This is an enlarged schematic diagram of the battery local vacuum laser welding device of the present invention being assembled on a bracket for welding.

[0027] Figure 5 This is a schematic diagram of the sealing and protective lens of the present invention.

[0028] Figure 6 This is another perspective view of the battery local vacuum laser welding apparatus of the present invention.

[0029] Figure 7 This is an enlarged schematic diagram of the battery local vacuum laser welding device of the present invention, which is assembled on a bracket and connected to external equipment for welding. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0031] See Figures 1 to 7 As shown in the exemplary embodiment of this application, the battery local vacuum laser welding device is used for laser welding of battery connecting pieces. It includes a laser beam guiding assembly. The laser beam guiding assembly includes a connecting seat 1 with a sealing protective lens 2 inside and a conical part 4 connected to the connecting seat and forming a laser beam guiding conical cavity inside. The sealing protective lens 2 is used to form a sealed welding space between itself and the welding area during welding. The smallest diameter end (bottom end shown in the figure) of the conical part 4 is the laser beam discharge end. A plurality of through holes 4-1 communicating with the laser beam guiding conical cavity are formed radially on the wall surface of the conical part 4. The plurality of through holes 4-1 are connected to a vacuum tube.

[0032] The battery local vacuum laser welding device of this application is used for welding the connecting piece 10 of the electrode assembly 100 to the battery cover plate 9. Before welding the connecting piece 10 to the battery cover plate 9, the electrode tab 11 of the electrode assembly 10 has been connected to the connecting piece 10 by a preceding ultrasonic welding process. Generally, during welding, two laser beam guiding components are required, corresponding to the welding positions of the positive and negative electrodes of the electrode, respectively.

[0033] In one embodiment, the maximum diameter end (i.e., its upper end) of the conical portion 4 is the laser beam entry end, which is connected and fixed to the connecting seat 1. The base plate of the connecting seat has an opening adapted to the laser beam entry end. In another embodiment, a high-temperature resistant elastic sealing ring 5 is embedded in the end face of the minimum diameter end of the conical portion for cooperation with the sealing protective lens 2 to form a sealed welding space in contact with the welding area, thereby ensuring the sealing of the lower part of the sealed area. This can be achieved by setting an embedding groove on the end face of the minimum diameter end of the conical portion, embedding the sealing ring therein, welding it to the surface, or fixing it in other ways.

[0034] The welding device in this application is a laser welding device, which needs to withstand the heat generated during the laser welding process. Metal spatter may cause deformation of the device and affect its sealing performance. Therefore, in this application, the laser beam guiding component is made of high-temperature resistant stainless steel and has sufficient strength to withstand the internal and external pressure difference during vacuuming, in order to meet the needs of the high-temperature laser welding environment. The sealing ring is located at the bottom of the device, closer to the welding area, where the temperature is highest, so it is made of high-temperature resistant fluororubber.

[0035] In one embodiment, the base plate of the connecting seat 1 is connected to four side walls, and the four side walls are connected end to end to form a closed enclosure structure in the circumference of the connecting seat, with an opening at the upper end for the laser beam emitted by the laser welding equipment to enter and perform welding.

[0036] In one embodiment, a sealing protective lens 2 is detachably arranged between the opening and the base plate of the connecting seat, for the laser beam to pass through and exit the conical section for welding. The assembly of the sealing protective lens and the connecting seat of the local welding device adopts a drawer-type structure, enabling rapid installation and removal of the protective lens and reducing equipment maintenance time costs.

[0037] In one embodiment, the sealing protective lens consists of a rectangular lens frame 2-2 and a quartz glass lens 2-1 defined by the lens frame on its outer periphery. Preferably, one sidewall has a matching lens inlet / outlet hole, and the inner surfaces of the other sidewalls have matching limiting grooves. The lens frame mates with the inlet / outlet hole and the limiting grooves to form a pull-out installation structure with the connecting seat, enabling quick replacement of the sealing protective lens. Since the laser emitted above the device needs to pass through the lens to irradiate the welding area, the light transmittance of the quartz glass lens 2-1 itself needs to reach 99.9% or higher to avoid loss during laser penetration. Furthermore, a sealing strip is provided at the mating position between the lens frame and the sidewall of the device connecting seat to ensure a tight fit with the connecting seat and prevent air leakage, thereby creating a vacuum-sealed environment in the welding area.

[0038] In one embodiment, the lens frame has symmetrical protrusions at opposite ends, the symmetrical protrusions being arranged near the operating end of the lens frame, and the symmetrical protrusions having screw holes 2-3 for locking the sealing protective lens to the connecting seat with locking screws. The axial direction of the screw holes is consistent with the pulling direction of the lens frame. After the symmetrical protrusions contact the two side walls, they can be locked with screws to connect and fix the sealing protective lens to the connecting seat. Of course, other methods of fixing can also be used, such as snap-fit, etc., and are not limited to this.

[0039] In one embodiment, the vacuum tube includes an annular tube 3. The inner wall of the annular tube has multiple openings adapted to the number of through holes 4-1. Each of the multiple openings is connected to the through hole 4-1 through a connector 3-1. The outer wall of the annular tube 3 has a hole that connects to the tube body 7 for connecting the vacuum pump 15. In a more preferred embodiment, the inner wall of the annular tube has four openings adapted to the number of through holes. The four through holes are arranged symmetrically in a central manner to form four vacuum channels, thereby achieving rapid vacuuming. In particular, in this application, the connection positions of the vacuuming holes are distributed in four directions around the circumference of the cone, which can realize simultaneous vacuuming from four directions of the sealed space during vacuuming. This can achieve the consistency of the vacuum degree inside the sealed space and avoid the quality difference of welding at different positions caused by gradient vacuum distribution.

[0040] In one embodiment, a gas pipe 6 for breaking the vacuum is connected to an opening on one side wall of the connecting seat 1. The opening is located below the sealing protective lens and is used to introduce gas into the local sealed space to break the vacuum after welding. This prevents the local vacuum device from being stuck to the welding position due to the pressure difference between the inside and outside, thus preventing the material from being separated. The gas pipe can be connected to a gas pump 14 to introduce gas into the welding sealed area after welding to break the vacuum.

[0041] In one embodiment, the battery local vacuum laser welding device further includes an adjustment base plate 8 or bracket with at least two mutually spaced adjustment elongated holes 8-1 along its length. At least two of the laser beam guiding components are arranging on the adjustment base plate through the position of the connecting seat. The upper ends of the two side walls of the connecting seat have screw holes 1-1, which can pass through the adjustment elongated holes and be connected to the adjustment base plate by locking screws. This is used to cooperate in welding the connecting pieces at the positive and negative positions of the electrode group. Since the position is adjustable, the distance can be flexibly adjusted by means of the adjustment base plate to adapt to the laser welding of different models of battery connecting pieces. The laser beam guiding components can be connected to the adjustment base plate by locking screws, which facilitates the replacement of different models of laser beam guiding components for welding.

[0042] The principle of local vacuum laser welding of batteries in this application is as follows:

[0043] During the initial loading process, the ultrasonically welded electrode assembly and battery cover are placed inside the positioning fixture. After the welding areas of the connecting piece and the cover are aligned, the assembly is moved to the welding position of the galvanometer laser 13. The local vacuum device then presses down to complete the local sealing of the welding area. Next, the vacuum pipeline connects to the vacuum pump 15 to create a local vacuum environment. Once the vacuum level reaches the required standard, the galvanometer laser 13 begins laser welding of the connecting piece. The laser penetrates the sealing protective lens to reach the welding area and begin welding. Finally, after welding is completed, the air pump connected to the air pipeline begins to circulate air into the local vacuum welding device to break the vacuum environment. Subsequently, the local vacuum device is lifted away from the welding position of the cover plate connecting piece, and the battery cell moves to the unloading position to complete the unloading. The specific operation steps are as follows:

[0044] Step 1: After ultrasonic final welding, the battery cell and battery cover plate structure are placed together at the loading position of the connecting piece laser welding. After pressing the start button, the battery cell and cover plate are moved to the galvanometer laser welding position.

[0045] Step 2: The local vacuum welding device is driven by a cylinder to press down and complete the local space sealing of the welding area of ​​the positive and negative electrode connecting pieces. The sealing ring at the bottom of the device is compressed and forms a tight fit after contacting the connecting piece by the downward pressure of the device. The downward pressure needs to be >1000N to ensure the sealing effect.

[0046] Step 3: Connect one end of the vacuum tube to the sealed welding space and the other end to the vacuum pump. The vacuum pump starts to evacuate the welding space. At the same time, the vacuum gauge 16 connected to the tube tests the vacuum level and sends a signal to the laser when it reaches below 50Pa.

[0047] Step 4: After receiving the signal, the galvanometer laser welder moves to the welding positions of the positive and negative connecting pieces respectively and emits a laser to complete the laser welding of the connecting pieces.

[0048] Step 5: After the laser welding is completed, the vacuuming stops, and the air pump 14 starts to deliver gas into the sealed cavity of the local vacuum welding device through the air pipe to break the vacuum environment and balance the pressure difference inside and outside the device.

[0049] Step 6: After the vacuum gauge 16 tests the air pressure to be close to atmospheric pressure, the pressure difference between the inside and outside of the surface device is eliminated. The semi-finished battery cell after welding is then moved to the unloading position for subsequent processing.

[0050] The plasma gas and dust generated during the welding process of the device in this application are removed by the continuous vacuuming of the vacuum tube to avoid affecting the laser's optical path and improve the stability of the molten pool. At the same time, the sealed space above the welding area is in a vacuum state, which isolates the influence of oxygen and other factors, thus ensuring the quality of the weld.

[0051] The battery local vacuum welding apparatus of this application first establishes a local vacuum by focusing on the welding area, eliminating the need for a full vacuum cabinet and resulting in higher efficiency and quality of vacuuming. Secondly, it is suitable for high-energy welding scenarios of connecting pieces, reducing plasma interference in a vacuum environment and improving energy utilization efficiency. Simultaneously, the vacuum environment significantly reduces weld oxidation and porosity defects, improving weld strength and consistency and ensuring welding quality. Finally, it eliminates the need for a continuous large amount of shielding gas, reducing production costs.

[0052] Laser welding of battery connectors typically requires high-energy welding, which is prone to problems such as spalling and porosity due to the welding environment. Utilizing the localized vacuum environment proposed in this application for laser welding improves welding quality while avoiding the low efficiency and poor vacuum consistency issues of large vacuum cabinets. Specifically, sealing rings and strips are installed at the bottom of the device and at the location where they mate with the protective lens, forming a locally sealed space when combined with the connector. Vacuum tubes are installed in four directions around the welding area to simultaneously extract vacuum, ensuring consistent vacuum levels within the sealed space and thus guaranteeing consistent welding quality.

[0053] In addition, this application isolates the atmospheric environment by evacuating the welding area, thus avoiding the influence of oxygen and other substances on the quality of laser welding. Therefore, the shielding gas in the welding process can be eliminated, saving the cost of shielding gas and supporting equipment.

[0054] Another aspect of this application provides a battery local vacuum laser welding method, implemented using the aforementioned battery local vacuum laser welding device, for laser welding of battery connecting pieces, including the following steps:

[0055] After the semi-finished battery cells to be welded are loaded, they are moved to the welding area;

[0056] After moving the laser beam guiding assembly above the welding area, press it down to seal the welding area;

[0057] The sealed space of the welding area is evacuated to a preset vacuum level, such as below 50Pa. The vacuum level can be controlled by monitoring the vacuum reading in real time using a vacuum gauge.

[0058] The laser welder is moved to the welding area, and under preset vacuum conditions, the laser beam is guided by the laser beam guiding component to perform vacuum welding.

[0059] After welding is completed, gas is introduced into the sealed area to break the vacuum, and the laser beam guiding component is moved away from the welding area. After the welded semi-finished cell leaves the welding position, it is unloaded, and the welding is completed.

[0060] The battery local vacuum welding apparatus and method of the present invention establishes a local vacuum by focusing the welding area, eliminating the need for a comprehensive vacuum cabinet. The equipment is compact, offers rapid vacuuming, and can achieve higher vacuum levels; it is suitable for high-energy welding scenarios involving connecting pieces. The battery local vacuum welding apparatus and method of the present invention reduce plasma interference in a vacuum environment, improve laser energy coupling efficiency, concentrate energy, and can weld through thicker materials at the same power, with less welding deformation, regular weld formation, and reduced spatter and cracking. The battery local vacuum welding apparatus and method of the present invention, using a vacuum environment, can significantly reduce weld oxidation and porosity defects, improve weld strength and consistency, and ensure welding quality; it eliminates the need for a continuous large amount of shielding gas, reducing production costs.

[0061] The welding device of this invention is mainly used in the laser welding of battery connectors. The negative electrode connector requires high welding energy and is sensitive to the welding environment. It is prone to defects such as oxidation, porosity, and explosion points, which affect the battery's current carrying capacity. The local vacuum welding of this invention improves energy utilization efficiency, enhances the stability of the molten pool, reduces porosity and explosion point defects, avoids oxidation, eliminates the need for protective gas, and reduces costs.

[0062] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention.

[0063] Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of the equivalents of the claims be included within the invention.

[0064] 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 battery local vacuum laser welding device, characterized in that, Laser welding of battery connectors includes a laser beam guiding assembly. The laser beam guiding assembly includes a connector with a sealing protective lens inside and a conical portion that forms a laser beam guiding conical cavity connected to the connector. The sealing protective lens is used to form a sealed welding space between itself and the welding area during welding. The smallest diameter end of the conical portion is the laser beam exhaust end. Multiple through holes communicating with the laser beam guiding conical cavity are formed radially on the wall surface of the conical portion. The multiple through holes are connected to a vacuum tube.

2. The battery local vacuum laser welding apparatus according to claim 1, characterized in that, The maximum diameter end of the tapered portion is the laser beam entry end, which is connected and fixed to the connecting seat. The base plate of the connecting seat has an opening adapted to the laser beam entry end. Preferably, a high-temperature resistant elastic sealing ring is embedded in the end face of the smallest diameter end of the tapered portion.

3. The battery local vacuum laser welding apparatus according to claim 1, characterized in that, The base plate of the connecting seat is connected to four side walls, and the four side walls are connected end to end to form a closed enclosure structure in the circumference of the connecting seat, with an open top.

4. The battery local vacuum laser welding apparatus according to claim 3, characterized in that, The sealing protective lens is detachably arranged between the opening and the base plate of the connecting seat, and a sealing strip is provided on the peripheral wall of the sealing protective lens that mates with the connecting seat.

5. The battery local vacuum laser welding apparatus according to claim 4, characterized in that, The sealing protective lens consists of a rectangular lens frame and a quartz glass lens that is surrounded and defined by the lens frame on its outer periphery.

6. The battery local vacuum laser welding apparatus according to claim 5, characterized in that, One of the sidewalls has a matching lens inlet / outlet hole, and the inner surfaces of the other sidewalls have matching limiting grooves. The lens frame mates with the inlet / outlet hole and the limiting groove to form a pull-out installation structure with the connecting seat.

7. The battery local vacuum laser welding apparatus according to claim 4, characterized in that, The lens frame has symmetrical protrusions at opposite ends, the symmetrical protrusions are arranged near the operating end of the lens frame, and the symmetrical protrusions are provided with screw holes, the axial direction of the screw holes being consistent with the pulling direction of the lens frame.

8. The battery local vacuum laser welding apparatus according to claim 1, characterized in that, The vacuum tube includes an annular tube with multiple openings on its inner wall corresponding to the number of through holes. Each of the multiple openings is connected to the through hole through a connector. The outer wall of the annular tube has a hole for connecting to the tube body for connecting the vacuum pump. Preferably, an opening is provided on one side wall of the connector for connecting a gas tube to break the vacuum.

9. The battery local vacuum laser welding apparatus according to claim 1, characterized in that, It includes an adjustment base plate with at least two mutually spaced adjustment holes along its length, at least two of the laser beam guiding components are adjustablely arranged on the adjustment base plate via the position of the connecting seat, and the connecting seat is connected to the adjustment base plate by locking screws.

10. Partial vacuum laser welding of batteries, characterized in that, The battery local vacuum laser welding apparatus according to any one of claims 1-9 is used for laser welding of battery connecting pieces, comprising the following steps: After the semi-finished battery cells to be welded are loaded, they are moved to the welding area; After moving the laser beam guiding assembly above the welding area, press it down to seal the welding area; Evacuate the sealed space in the welding area to the preset vacuum level; The laser welder is moved to the welding area, and under preset vacuum conditions, the laser beam is guided by the laser beam guiding component to perform vacuum welding. After welding is completed, gas is introduced into the sealed area to break the vacuum, and the laser beam guiding component is moved away from the welding area. After the welded semi-finished cell leaves the welding position, it is unloaded, and the welding is completed.

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