Horizontal sealing welding device for cylindrical battery

Abstract

The utility model belongs to the technical field of new energy lithium battery manufacturing, and particularly relates to a cylindrical battery horizontal seal welding device which comprises a dust hood structure and a protective air pipe, the dust hood structure comprises a dust hood and a connecting pipe, and one end of the connecting pipe is provided with a magnet used for being connected with the dust hood in an adsorption mode so that the connecting pipe can be communicated with the dust hood. The dedusting cover comprises a first dedusting cover and a second dedusting cover which are of a split structure and are connected into a dedusting pipe through magnets. The end, close to a to-be-welded cylindrical battery welding seam, of the dedusting cover is provided with a semicircular groove covering the outer side of the welding seam. The side wall of the dust removal cover is provided with a long hole for a protective gas pipe to penetrate through, one end of the protective gas pipe is a protective gas outlet facing a welding area, and the other end is hinged to a spherical joint outside the dust removal cover. The dust removal effect is improved, and the dust removal cover is convenient to clean.

Description

Technical Field

[0001] The utility model belongs to the technical field of new energy lithium battery manufacturing, and particularly relates to a horizontal sealing and welding device for cylindrical batteries. Background Technique

[0002] With the strong support of the country for the development of new energy, large cylindrical batteries have emerged with the advantages of high capacity, high rate, good heat dissipation, and low cost. And the sealing and welding of the cylinder is an important process in monomer assembly.

[0003] For the assembly and sealing welding process of cylindrical batteries, there are two technical directions. One is horizontal welding, and the other is vertical welding. Both methods have their own advantages and disadvantages. The utility model makes improvements to horizontal welding. The welding process of cylindrical batteries is divided into single-pass and double-pass. Single-pass is to weld only the seal on one side of the cylindrical battery, and double-pass is to weld the seals on both sides of the cylindrical battery.

[0004] At present, in the existing technology, there are disadvantages such as poor dust removal effect in the sealing and welding of cylindrical batteries. Content of the Utility Model

[0005] To solve the above technical problems, the utility model provides a horizontal sealing and welding device for cylindrical batteries.

[0006] The purpose of the utility model is to be achieved by the following technical solutions. A horizontal sealing and welding device for cylindrical batteries proposed according to the utility model includes a dust removal cover structure and a protective gas pipe. The dust removal cover structure includes a dust removal cover and a connecting pipe. One end of the connecting pipe is provided with a magnet for adsorbing and connecting with the dust removal cover to make the connecting pipe communicate with the dust removal cover. The dust removal cover includes a first dust removal cover and a second dust removal cover that are in a split structure and are connected into a dust removal pipe by a magnet. The end of the dust removal cover close to the weld of the cylindrical battery to be welded is provided with a semi-circular groove covering the outside of the weld; a long hole for passing through the protective gas pipe is provided on the side wall of the dust removal cover. One end of the protective gas pipe is a protective gas outlet facing the welding area, and the other end is hinged to a spherical joint located outside the dust removal cover.

[0007] Further, the other end of the connecting pipe is provided with a flange for connecting with a negative pressure device.

[0008] Further, the cross-section of the end of the dust removal pipe close to the connecting pipe is circular and matches the connecting pipe, the cross-section of the end close to the weld is rectangular, and the pipe between the two ends of the dust removal pipe is a gently transitioned pipeline.

[0009] Further, the protective gas outlet is close to the light outlet of the laser, and the included angle range between the blowing direction of the protective gas and the light emitting direction of the laser is 30-60°.

[0010] Further, the tangential direction of rotation of the outer circumference of the cylindrical battery near the protective gas outlet is opposite to the blowing direction of the protective gas.

[0011] Further, the light outlet of the laser and the protective gas outlet are both located on one side of the radial line in the vertical direction of the cylindrical battery. The laser is located above the cylindrical battery and its light-emitting direction is vertically downward.

[0012] Further, the other end of the spherical joint is used to connect to a nitrogen source.

[0013] The beneficial effects of the present utility model are as follows:

[0014] The connecting pipe and the dust removal cover are separately arranged and connected by magnets. The dust removal cover is of a split structure and connected by magnets, which can be easily disassembled and installed, facilitating the cleaning of the internal welding slag and dust.

[0015] A semi-circular groove for wrapping the weld seam is provided on the dust removal cover, increasing the contact area with the splashed welding slag and dust, and improving the dust removal efficiency.

[0016] The angle of the protective gas pipe can be adjusted, facilitating the adjustment of the blowing direction of the protective gas according to specific circumstances.

[0017] The above description is only an overview of the technical solution of the present utility model. In order to be able to more clearly understand the technical means of the present utility model, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present utility model more obvious and understandable, the following specifically gives preferred embodiments and, in conjunction with the drawings, is described in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the welding area during welding in an embodiment of a horizontal sealing welding device for a cylindrical battery of the present utility model.

[0019] Figure 2 It is a schematic diagram of the change of the welding power of the laser used in an embodiment of a horizontal sealing welding device for a cylindrical battery of the present utility model over time.

[0020] Figure 3 It is a three-dimensional schematic diagram of the structure of the dust removal cover in an embodiment of a horizontal sealing welding device for a cylindrical battery of the present utility model.

[0021] Figure 4 is Figure 3 A three-dimensional schematic diagram from another perspective;

[0022] Figure 5 is Figure 3 The front schematic diagram of;

[0023] Figure 6 is Figure 3Exploded schematic diagram of the dust removal cover structure shown;

[0024] Figure 7 Stereo schematic diagram of an embodiment of a horizontal sealing and welding device for cylindrical batteries of the present utility model;

[0025] Figure 8 is Figure 7 Schematic diagram of the component on side A in;

[0026] Figure 9 is Figure 7 Schematic diagram of the component on side b in.

[0027]

Reference Signs

[0028] 1 - Component on side A, 101 - First servo motor, 102 - First pushing cylinder, 103 - First oil buffer, 104 - First jaw cylinder, 105 - First jaw, 106 - First pressure foot cylinder, 107 - First pressure foot, 108 - First base, 109 - First slide.

[0029] 2 - Component on side B, 201 - Second servo motor, 202 - Second pushing cylinder, 203 - Second oil buffer, 204 - Second jaw cylinder, 205 - Second jaw, 206 - Second pressure foot cylinder, 207 - Second pressure foot, 208 - Second base, 209 - Second slide.

[0030] S - Welding starting point, E - Welding ending point, L0, L1, L2, L3, L4 - Arc lengths corresponding to each welding area, C - Dust removal cover structure, C1 - Dust removal cover, C11 - First dust removal cover, C12 - Second dust removal cover, C13 - Long hole, C14 - Semi - circular groove, C2 - Connecting pipe, C21 - Flange, D1 - Protective gas pipe, D2 - Ball joint, 3 - Cylindrical battery, 301 - Cover plate, 302 - Outer shell, 4 - Laser. Detailed Embodiment

[0031] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0032] An embodiment of a horizontal sealing and welding device for cylindrical batteries of the present utility model is as Figures 1 to 9As shown, after the welding device fixes the cylindrical battery 3, during welding, the horizontal welding device first drives the cylindrical battery 3 to rotate, and the circumferential weld of the cylindrical battery 3 can sequentially pass through the extended light-emitting line of the fixedly arranged laser; starting the laser can achieve full-weld welding of the seal of the cylindrical battery 3. The rotation speed of the horizontal welding device driving the cylindrical battery 3 and the welding power of the laser are coordinated to determine the welding speed of the cylindrical battery 3.

[0033] After the cylindrical battery 3 is fixed at the full-weld position of the horizontal welding device, the horizontal welding device drives the cylindrical battery 3 to rotate. The rotation speed of the cylindrical battery accelerates from rest to a constant speed, and then the laser emits light to weld the cylindrical battery 3. After full-weld is achieved, the laser turns off, and the rotation speed of the cylindrical battery 3 decelerates from a constant speed to rest.

[0034] In this embodiment, the laser uses a multimode ring laser. Its outer ring is responsible for expanding the keyhole opening, and its inner ring is responsible for the welding penetration depth. The ring laser can suppress the splash of metal vapor and reduce the requirement for dust removal during welding.

[0035] The laser performs circumferential welding on the weld of the cylindrical battery 3 to form a circumferential welding area. When setting the slow-rise and slow-fall power of the laser for welding, according to the welding power of the laser for the cylindrical battery, the weld of the cylindrical battery 3 is divided into multiple circumferentially distributed welding areas. The projection of each welding area on the end face of the cylindrical battery is an arc, and the arc length represents the welding area. Starting from the welding starting point S of the laser for the cylindrical battery, they are successively the arc length L0, arc length L1, arc length L2, arc length L3, welding end point E, arc length L4, welding starting point S, as Figure 1 shown. The inner circle and the outer arc are used to represent the welding area of the cylindrical battery 3. The corresponding part of the outer arc and the inner circle is the same welding area of the cylindrical battery 3. In order to distinguish the repeated welding of the same welding area, it is divided into a circle and an arc.

[0036] When the cylindrical battery 3 rotates at a constant speed, the laser is turned on to start welding the cylindrical battery 3. At this time, the light emitted by the laser first contacts the welding starting point S of the cylindrical battery 3. As the cylindrical battery rotates, the welding power of the laser gradually increases (the gradually increasing welding power is the slow-rise starting power), and the light emitted by the laser forms a welding area corresponding to the arc length L0 on the cylindrical battery 3. After passing through the welding area corresponding to the arc length L0, the welding power of the laser reaches the full power. Then, as the cylindrical battery 3 rotates, the full-power light emitted by the laser sequentially passes through the welding areas corresponding to the arc lengths L1, L2, L3, L4, L0, and L1. While performing full-power welding on the circumferential weld of the cylindrical battery 3, the full-power welding area is superimposed on the slow-rise starting power welding area corresponding to the arc length L0 and the full-power welding area corresponding to the arc length L1. After passing through the welding area corresponding to the arc length L1, the power of the laser gradually decreases. At this time, the light emitted by the laser passes through the welding area corresponding to the arc length L2, and the low-power welding area is superimposed on the full-power welding area here. After passing through the welding area corresponding to the arc length L2, the power of the laser gradually decreases again. At this time, the light emitted by the laser passes through the welding area corresponding to L3 until the power of the laser decreases to zero. At this time, the laser is aligned with the welding end point E, and the lower-power welding area is superimposed on the welding area corresponding to L3, and the welding is completed. The power of the laser decreases faster in the welding area corresponding to L2 than in the welding area corresponding to L3.

[0037] It can be seen from this that the welding areas corresponding to the arc lengths L0, L1, L2, and L3 of the cylindrical battery 3 are welding overlapping areas, and the welding area corresponding to L4 is a non-overlapping area. The welding area corresponding to the arc length L0 undergoes two different power weldings by the laser, namely slow-rise starting power welding and full-power welding. Therefore, this welding area is the starting power overlapping area. The welding area corresponding to the arc length L1 undergoes two full-power weldings. Therefore, this welding area is the full-power overlapping area. The welding areas corresponding to the arc lengths L2 and L3 both undergo two different power weldings by the laser, both full-power welding and welding when the welding power gradually decreases. Therefore, the welding areas corresponding to the arc lengths L2 and L3 are low-power overlapping areas, as Figure 1 shown.

[0038] In the starting power overlapping area, it corresponds to the power slow-rise stage of the laser and the full-power welding stage superimposed in the second circle. The purpose is to make the molten pool slowly transition to the overlapping area and reduce the risk of white explosion points caused by unstable molten pools. The full-power overlapping area is the area for transitioning to the low-power overlapping area. The low-power overlapping area corresponds to the power slow-drop stage of the laser and is divided into several segments ( Figure 2 shown as 2 segments) to achieve a smooth transition and optimize the depression at the end of welding, which is beneficial to reducing the defect of the depression at the end point.

[0039] In this embodiment, the welding area is divided into five. In other embodiments, by increasing the welding area corresponding to the decrease in the laser power, more low-power overlapping welding areas can be set to achieve the best welding effect.

[0040] Such as Figure 2 shown is a schematic diagram of the change in the laser welding power over time when welding the cylindrical battery 3. The upper broken line is the change curve of the outer ring power of the laser, and the lower broken line is the change curve of the inner ring power of the laser. The rotation speed of the cylindrical battery 3, that is, the welding speed, is v, t whole is the time required for the cylindrical battery 3 to complete one full circle of welding, t0 is the time for the welding power set by the laser to gradually increase, t1 is the time for the laser to perform full-power welding, t whole is included in the time period of t1, t2 is the time for the welding power set by the laser to gradually decrease, t3 is the time for the welding power set by the laser to further decrease to zero. It can be seen from Figure 2 this that the speed of the welding power decrease in the t2 time period is faster than that in the t3 time period. The arc lengths corresponding to each section of the welding area can be calculated from the above parameters: L0 = t0 * v, L1 = (t1 - t whole) * v, L2 = t2 * v, L3 = t3 * v, L4 = (2t whole - t0 - t1 - t2 - t3) * v.

[0041] The angle and flow rate of the welding protective gas need to cover the area during welding to prevent the welding material from being oxidized during welding. For the welding spatter direction during the welding of the cylindrical battery 3, a dust removal hood structure C is designed. As Figures 3 to 6 shown, the position covered by the dust removal hood structure C is kept in the same direction as the direction of most of the welding slag spatter relative to the cylindrical battery 3, and it can effectively suck away the welding slag and fumes generated during welding.

[0042] The dust removal hood structure C includes a dust removal hood C1 and a connecting pipe C2. One end of the connecting pipe C2 is provided with a flange C21 for connecting with a negative pressure device to suck away the welding slag and fumes generated by laser welding. The other end of the connecting pipe C2 is provided with a magnet for adsorbing and connecting with the dust removal hood C1. The dust removal hood C1 is of a split structure, including a first dust removal hood C11 and a second dust removal hood C12, which is convenient for disassembly and facilitates the cleaning of welding slag. The first dust removal hood C11 and the second dust removal hood C12 can be adsorbed and butted through magnets to form a dust removal pipe. The cross-section of the end of the dust removal pipe close to the connecting pipe C2 is circular and matches the connecting pipe C2, and the cross-section of the end close to the weld is rectangular. The pipe between the two ends of the dust removal pipe is a gently transitional pipe. The connecting pipe C2 and the dust removal hood C1 are fixedly connected by magnetic attraction, which is convenient for disassembly and facilitates the timely cleaning of welding slag. The end of the dust removal hood C1 close to the weld of the cylindrical battery is provided with a semi-circular groove C14 that covers the outside of the weld, semi-surrounding the weld of the cylindrical battery 3. When welding the cylindrical battery 3, the direction of welding slag splashing cannot be accurately predicted. Only considering the direction with more welding splashing, the part of the semi-circular groove C14 that wraps and covers the cylindrical battery 3 is the part where most of the welding slag splashes out, improving the dust removal efficiency.

[0043] A long hole C13 is provided on the side wall of the dust removal hood C1. The protective gas pipe D1 extends into the dust removal hood C1 from the long hole C13, and protective gas is blown into the dust removal hood C1 through the protective gas outlet at the end of the protective gas pipe. The protective gas is usually nitrogen. The end of the protective gas pipe D1 facing the welding area is a nitrogen blowing port, and the other end of the protective gas pipe D1 is a spherical joint D2 located outside the dust removal hood C1. The other side of the spherical joint D2 is connected to a nitrogen source. Through the spherical joint D2, it is convenient to adjust the angle of the protective gas pipe D1, and then change the angle of nitrogen blowing to adjust the angle of the nitrogen flow direction. The nitrogen blowing port is aligned with the battery sealing welding area, and the included angle between the blowing direction of nitrogen and the light emitting direction of the laser 4 is between 30 - 60°. This angle is the optimal angle. As Figure 5 shown, the long hole C13 leaves space for the angle adjustment of the protective gas pipe D1, facilitating the adjustment of the angle and position of the protective gas pipe D1.

[0044] During the rotation of the cylindrical battery 3, the tangential direction of the rotation of the part of its outer circumference close to the nitrogen blowing port is opposite to the blowing direction of nitrogen, which can make the molten pool form better. As Figure 5As shown in the figure. The light outlet of the laser 4 and the nitrogen blowing port are both located on one side of the radial line in the vertical direction of the cylindrical battery 3. The laser 4 is located above the cylindrical battery and its light-emitting direction is vertically downward, blowing the welding slag and dust to the other side of the radial line, increasing the contact area between the semi-circular groove and the welding slag and dust, and improving the dust removal efficiency. During welding, most of the welding slag or dust splashes in the same direction as the rotation tangent direction of the cylindrical battery without nitrogen blowing; in the case of nitrogen blowing, most of the welding slag or dust is affected by the nitrogen gas flow and is opposite to the rotation tangent direction. Therefore, when nitrogen is blown, it can prevent the welding slag or dust from affecting the subsequent welding. By blowing nitrogen, it can prevent the welding material (aluminum) from being oxidized, which has a positive impact on the weld formation, reducing pores, and dust removal. Nitrogen can blow away the plasma generated during welding and improve the weld quality.

[0045] The dust removal hood structure C, the laser 4, and the spherical joint D2 are all arranged on the welding device.

[0046] Through the above-mentioned cylindrical battery horizontal sealing welding device and the power setting of the laser with slow rise and fall in multiple layers, the defect of collapse at the end of welding can be optimized, and the sealing welding efficiency of the cylindrical battery can be improved; through the above-mentioned peripheral dust removal hood structure, the dust removal effect is enhanced.

[0047] The embodiment of the present invention can adopt a horizontal sealing welding device for cylindrical batteries as shown in Figures 7 to 9 the figure. This embodiment is described by taking the double-pass welding of cylindrical batteries as an example. The cylindrical battery 3 includes a cylindrical shell 302 with openings at both ends, and the cover plates 301 are welded to the openings at both ends of the shell to seal the cylindrical battery 3. Before welding with the welding device of the present invention, the two ends of the cylindrical battery 3 are pre-welded (spot welding or wire welding + oscillation, and the pre-welding part between the shell 302 and the cover plate 201 is usually divided into several sections) with the cover plates to fix the cover plates at the ends of the cylindrical battery 3. A weld seam is formed between the edge of the cover plate 301 and the end of the shell 302, and the weld seam is fully welded by this welding device. The structures such as the cover plates and the shells on the cylindrical battery 3 are all prior arts and will not be elaborated here.

[0048] The welding device of the present invention includes two symmetrically arranged clamping mechanisms for clamping the cylindrical battery 2 and a laser 4 for welding the cylindrical battery. For the convenience of description, the two symmetric clamping mechanisms are the A-side component 1 and the B-side component 2 respectively. The A-side component 1 and the B-side component 2 are symmetrically arranged and act together on the cylindrical battery 3. The A-side component 1 is taken as an example for description. The laser 4 is located above the A-side component 1 and the B-side component 2 and is used for welding the cylindrical battery 3.

[0049] The A-side component 1 includes a first servo motor 101, a first push cylinder 102, a first oil buffer 103, a first jaw cylinder 104, a first jaw 105, a first pressure foot cylinder 106, and a first pressure foot 107.

[0050] The first thrust cylinder 102 is fixedly arranged on the first base 108 , and the first slide 109 is horizontally slidably arranged on the first base 108 . The output shaft end of the first thrust cylinder 102 is connected to the first slide 109 . Under the thrust of the first thrust cylinder 102 , the first slide 109 slides on the first base 108 .

[0051] The first servo motor 101 is fixedly mounted on the first slide 109, and the first gripper cylinder 104 is rotatably mounted on the first slide 109. The rotating shaft of the first servo motor 101 coincides with the central axis of the first gripper cylinder 104. The first gripper cylinder 104 is a prior art and will not be described in detail herein. The output shaft end of the first servo motor 101 is fixed on the first gripper cylinder 104, and the rotation of the first servo motor 101 can drive the first gripper cylinder 104 to rotate.

[0052] The first clamping jaw 105 is arranged on the first clamping jaw cylinder 104, and the central axis of the first clamping jaw cylinder 104 coincides with the central axis of the first clamping jaw 105. The first clamping jaw cylinder 104 can drive the first clamping jaw 105 to open and close to loosen or clamp an object. This is the prior art and will not be described in detail here.

[0053] A plurality of clamp fingers are circumferentially distributed on the first clamp 105. In the present embodiment, a total of three clamp fingers are provided. When the first clamp 105 is used to clamp the cylindrical battery, the concentricity of the cylindrical battery is ensured. Under the action of the first clamp cylinder 104, the three clamp fingers can move toward or away from the central axis of the three first clamps 5, thereby clamping or loosening the cylindrical battery. When the clamp clamps the cylindrical battery, the central axis of the clamp coincides with the central axis of the cylindrical battery. The extension direction of the clamp fingers is parallel to the central axis of the first clamp 105 and faces the B side component 2. The rotating shaft of the first servo motor 101 coincides with the central axis of the first clamp cylinder 104 and the central axis of the first clamp 105. After the first clamp 105 clamps the cylindrical battery 3, the rotating shaft of the first servo motor 101 drives the cylindrical battery 3 to rotate.

[0054] The first presser foot cylinder 106 is fixedly arranged at the center position of the first clamping jaw 105, and the output shaft of the first presser foot cylinder 106 coincides with the center axis of the first clamping jaw 105. The output shaft of the first presser foot cylinder 106 extends toward the B side component 2, and the first presser foot 107 is arranged at its end, and the first presser foot 107 is in the shape of a round cover or a disc. Under the action of the first presser foot cylinder 106, the first presser foot 107 approaches or moves away from the B side component 2. Under the action of the first presser foot cylinder 106, the first presser foot 107 approaches the cover plate of the cylindrical battery, and during welding, the pole, explosion-proof valve, QR code, and liquid injection port on the cover plate are protected to prevent impurities such as welding slag from falling into the liquid injection port or sticking to the pole, and to prevent the pole, explosion-proof valve, and QR code from being damaged. The specific structure of the cylindrical battery is prior art and will not be repeated here.

[0055] A first oil buffer 103 is provided on the first sliding table 109 to position the entire first sliding table 109 and absorb vibrations. This is prior art and will not be elaborated here.

[0056] In this embodiment, both the positive and negative electrodes of the cylindrical battery are provided with pole columns, which are bipolar columns (a positive pole column and a negative pole column respectively), and double-pass welding is adopted. This device can also be used for single-pass welding of cylindrical batteries. The QR code on the cover plate can be set as required.

[0057] The second servo motor 201, second push cylinder 202, second oil buffer 203, second jaw cylinder 204, second jaw 205, second presser foot cylinder 206, second presser foot 207, second base 208, and second sliding table 209 on the B-side component 2 are symmetrically located with respect to the corresponding components on the A-side component. For easy distinction, the component prefix "first" is used for the components in the A-side component 1, and the corresponding component prefix "second" is used for the components in the B-side component 2. However, the corresponding components on both sides are substantially the same and will not be elaborated here.

[0058] For the double-pass welding of cylindrical batteries, the specific operation process of this device is as follows:

[0059] 1. Fix the corresponding cover plates 301 at both ends of the cylindrical battery 3 by pre-welding.

[0060] 2. The first push cylinder 102 of the A-side component 1 pushes the first sliding table 109 to the welding position. At this time, the A-side component 1 is the non-welding side, and the B-side component is the welding side (B welding side).

[0061] 3. The first jaw 105 of the A-side component 1 closes to clamp the outer wall of the cylindrical battery 3, and the end of the cylindrical battery 3 facing the B-side component 2 is exposed. At this time, the end of the cylindrical battery 3 close to the A-side component 1 is the non-welding side, and the end close to the B-side component 2 is the welding side (B welding side).

[0062] 4. The output shaft of the second presser foot cylinder 206 of the B-side component 2 extends, so that the distance between the presser foot end face of the second presser foot 207 and the cover plate on the B welding side of the cylindrical battery is 0.1 - 0.3 mm, so that the presser foot end face does not contact the cover plate, preventing friction and damage to the battery cover plate, and at the same time protecting the cover plate.

[0063] 5. The laser 4 reaches above the weld on the B welding side of the cylindrical battery and sets the power of the laser 4. Adjust the position of the dust removal cover structure C and the angle of the protection air pipe D1. The first servo motor 101 drives the first jaw cylinder 104 to rotate, and then drives the cylindrical battery 3 to rotate. When the rotation of the cylindrical battery 3 accelerates to a uniform state, light is emitted for welding to ensure that the welding of the weld of the cylindrical battery 3 is carried out during the uniform speed section.

[0064] 6. After the welding of the weld seam on the welding side of the cylindrical battery 3B is completed, a switch is made. After the switch, the component 1 on the A side is the welding side (A welding side), the component 2 on the B side is the non-welding side, one end of the cylindrical battery 3 close to the component on the A side is the welding side (A welding side), and one end close to the component on the B side is the non-welding side;

[0065] 7. The second pressing foot cylinder 206 of the component 2 on the B side contracts, the second pushing cylinder 202 pushes the second sliding table 209 to the welding position, and the second clamping jaw 205 closes to clamp the cylindrical battery 3;

[0066] 8. The first clamping jaw 105 of the component 1 on the A side opens, the output shaft of the first pushing cylinder 102 contracts to drive the first sliding table 109 to retreat, the output shaft of the first pressing foot cylinder 106 extends, so that the first pressing foot 107 approaches the cover plate on the A welding side of the cylindrical battery, and the distance between the end face of the first pressing foot 107 and the cover plate on the A welding side of the cylindrical battery 3 is 0.1 - 0.3 mm. The laser 4 reaches above the battery weld seam on the A welding side of the cylindrical battery and sets the position of the power adjustment dust removal cover structure C of the laser 4 and the angle of the protection air pipe D1. The second servo motor 101 of the component 2 on the B side drives the second clamping jaw cylinder 204 to rotate, and then drives the cylindrical battery 3 to rotate. The welding of the A welding side is completed during the uniform rotation stage of the cylindrical battery 3;

[0067] 9. The first pressing foot cylinder 106 contracts, the second clamping jaw 205 loosens, the cylindrical battery 3 is taken out, and the component 1 on the A side and the component 2 on the B side return to the initial state, waiting for the next cycle.

[0068] The present utility model provides a new horizontal welding device. This device uses clamping jaws (the first clamping jaw 105 or the second clamping jaw 205) to clamp the cylindrical battery 3, and the pressing foot (the first pressing foot 107 or the second pressing foot 207) approaches but does not contact the cover plate. It does not use an adhesive layer to clamp the cylindrical battery 3, does not provide frictional force, avoids the welding defects caused by the reduction in the thickness and damage of the adhesive layer due to the pressing foot being subjected to high temperature and friction, keeps the weld position unchanged, improves the sealing yield of the cylindrical battery 3, reduces the consumption of the pressing foot (if the pressing foot contacts the cover plate and is fixed by static friction, under the action of high temperature and friction, the adhesive layer of the pressing foot wears quickly. At the same time, if the pressing foot needs to keep clamping the cylindrical battery 3, it will change the weld position, resulting in a change in the weld position in the height direction of the cylindrical battery 3, causing a change in the position of the laser relative to the weld position. Since the laser has high requirements for the weld position accuracy, the deviation is generally ±0.1 mm. After welding deviation occurs, it is easy to produce welding defects and reduce the welding yield), and reduces costs; the pressing foot does not contact the cover plate, will not scratch the surface of the battery cover plate, and the pressing foot is close to the cover plate, avoiding dust and welding slag during welding from entering the liquid injection port, and can protect the cover plate and the pole column, explosion-proof valve, two-dimensional code, etc. on the cover plate.

[0069] In other embodiments of the horizontal sealing and welding device for cylindrical batteries of the present utility model, an existing welding device may also be used, and the dust removal cover structure C, the protective air pipe D1, and the spherical joint D2 are arranged on the welding device.

[0070] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A cylindrical battery horizontal sealing welding device, including a dust removal cover structure and a protective air pipe, characterized in that: The dust hood structure includes a dust hood and a connecting pipe. One end of the connecting pipe is provided with a magnet for being adsorbed and connected to the dust hood so as to connect the connecting pipe to the dust hood. The dust hood includes a first dust hood and a second dust hood which are in a split structure and are connected to form a dust pipe by magnets. The dust hood is provided with a semicircular groove covering the outside of the weld near the end of the cylindrical battery weld to be welded; the side wall of the dust hood is provided with a long hole for passing a protective air pipe, one end of the protective air pipe is a protective gas outlet facing the welding area, and the other end is hinged to a spherical joint located on the outside of the dust hood.

2. A cylindrical battery horizontal sealing welding device according to claim 1, characterized in that: The other end of the connecting pipe is provided with a flange for connecting to a negative pressure device.

3. A cylindrical battery horizontal sealing welding device according to claim 1, characterized in that: The cross section of the end of the dust removal pipe close to the connecting pipe is circular and matches the connecting pipe, and the cross section of the end close to the welding seam is rectangular. There is a smooth transition pipe between the two ends of the dust removal pipe.

4. A cylindrical battery horizontal sealing welding device according to claim 1, characterized in that: The shielding gas outlet is close to the light outlet of the laser, and the angle between the blowing direction of the shielding gas and the light outlet direction of the laser is in the range of 30-60°.

5. A cylindrical battery horizontal sealing welding device according to claim 1, characterized in that: The rotation tangent direction of the portion of the outer circumference of the cylindrical battery close to the shielding gas outlet is opposite to the blowing direction of the shielding gas.

6. A cylindrical battery horizontal sealing welding device according to claim 4, characterized in that: The light outlet and the protective gas outlet of the laser are both located on one side of the radial line of the cylindrical battery in the vertical direction. The laser is located above the cylindrical battery and its light outlet direction is vertically downward.

7. A cylindrical battery horizontal sealing welding device according to claim 1, characterized in that: The other end of the ball joint is used for connecting to a nitrogen source.

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