Laser welding device

Abstract

The utility model relates to the technical field of battery production equipment, and discloses a laser welding device, which comprises a first pressing mechanism, a second pressing mechanism and a laser welding mechanism, the first pressing mechanism comprises a first pressing block structure, a first pressing position is formed on the first pressing block structure, the first pressing block structure is provided with a first light-transmitting area, and the first light-transmitting area corresponds to the first pressing position; the laser is arranged on the side, deviating from the first pressing position, of the first pressing block structure; the driving structure is suitable for driving the laser to move. The first pressing block structure is used for pressing the Mylar film on the battery top cover, laser can pass through the first light-transmitting area and is emitted from the first pressing position of the first pressing block structure, and the driving structure can drive the laser device to move, so that the Mylar film and the battery top cover can be welded at a plurality of different positions; the Mylar membrane and the battery top cover are connected in a laser welding mode, and the laser welding method has the advantages of being high in working efficiency, accurate and controllable in welding process, low in production cost and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production equipment, in particular to a laser welding device. Background Art

[0002] In the manufacturing process of square shell lithium batteries, it is usually necessary to wrap an insulating film on the outer surface of the battery cell. The insulating film is generally a Mylar film. In the battery production process, the battery cell and the battery top cover are assembled first, and then the battery cell is put into the shell, and then the shell and the battery top cover are welded. When assembling the battery cell and the battery top cover, it is usually necessary to connect and fix the Mylar film to the battery top cover. In the prior art, the Mylar film and the insulating strip of the battery top cover are usually melted and bonded by hot melting to achieve a fixed connection. However, during hot melting, the molten material will stick to the hot melt head, causing damage to the hot melt head, and the hot melt head needs to be replaced frequently, resulting in waste. Utility Model Content

[0003] In view of this, the utility model provides a laser welding device to solve the problem that in the prior art, the Mylar film and the battery top cover are connected by hot melting, the molten material will stick to the hot melting head, causing damage to the hot melting head, and the hot melting head needs to be replaced frequently, resulting in waste.

[0004] The utility model provides a laser welding device, comprising: a first pressing mechanism, comprising a first pressing block structure, the first pressing block structure forming a first pressing position, the first pressing position being suitable for providing a vertical pressing force to a battery cell, the first pressing block structure having a first light-transmitting area, the first light-transmitting area corresponding to the first pressing position; a laser, arranged on a side of the first pressing block structure away from the first pressing position, the laser being suitable for emitting laser to the first pressing block structure and transmitting to the first pressing position through the first light-transmitting area; and a driving structure being suitable for driving the laser to move.

[0005] Beneficial effect: The Mylar film is pressed onto the battery top cover by the first pressing block structure, and the laser is emitted to the first pressing block structure by the laser. The laser can pass through the first light-transmitting area and be emitted from the first pressing position of the first pressing block structure to laser weld the Mylar film and the battery top cover. The driving structure can drive the laser to move, so that the Mylar film and the battery top cover can be welded at multiple different positions. Therefore, the Mylar film and the battery top cover are connected by laser welding, which has the advantages of high work efficiency, precise and controllable welding process, and low production cost.

[0006] In an alternative embodiment, two first pressing mechanisms are provided. The first pressing blocks of the two first pressing mechanisms are arranged at intervals relative to each other in the vertical direction, so that the first pressing positions of the two first pressing blocks are arranged at intervals relative to each other to form a pressing space, and at least one of the first pressing blocks is movably arranged in the vertical direction.

[0007] Advantageous effects: The two first pressing mechanisms are used to press the Mylar film and the battery top cover on the opposite sides of the battery cell, and then cooperate with the laser to realize the welding of the Mylar film and the battery top cover on the opposite sides of the battery cell, improving the welding efficiency.

[0008] In an alternative embodiment, at least two lasers are provided. The at least two lasers are respectively arranged corresponding to the two first pressing mechanisms. Each first pressing mechanism corresponds to at least one laser, and the driving structure is adapted to drive each laser to move at least in the horizontal direction.

[0009] In an alternative embodiment, the laser welding device further includes a mounting structure, and each laser is arranged on the mounting structure. The driving structure is in transmission connection with the mounting structure; alternatively, the driving structure includes at least two driving units, the at least two driving units are arranged corresponding to the at least two lasers, and each driving unit is in transmission connection with at least one laser.

[0010] Advantageous effects: When the driving structure drives the mounting structure to move, all the lasers can be driven to move simultaneously, so that all the lasers can weld the Mylar film and the battery top cover on both sides of the battery cell respectively, improving the welding efficiency.

[0011] In an alternative embodiment, one laser is provided, and the driving structure is adapted to drive the laser to move around the two first pressing blocks.

[0012] In an alternative embodiment, a battery cell loading position is formed opposite to the first pressing position in the vertical direction; the first pressing block is adapted to approach or move away from the battery cell loading position in the vertical direction, and / or the battery cell at the battery cell loading position is adapted to approach or move away from the first pressing position under the drive of an external driving device.

[0013] In an alternative embodiment, the battery cell at the battery cell loading position is adapted to be flipped under the drive of an external driving device, so that different surfaces of the battery cell face the first pressing position.

[0014] In an alternative embodiment, the laser welding device further includes a battery cell fixing mechanism, and the first pressing mechanism is disposed above or below the battery cell fixing mechanism, so that the first pressing position and the battery cell fixing mechanism are spaced apart relatively to form a pressing space, and the battery cell fixing mechanism and / or the first pressing block structure are movably disposed in the vertical direction.

[0015] In an alternative embodiment, the battery cell fixing mechanism is adapted to drive the battery cell to flip, so that different surfaces of the battery cell face the first pressing position.

[0016] In an alternative embodiment, the laser welding device further includes a second pressing mechanism, the second pressing mechanism includes a second pressing block structure, the second pressing block structure forms a second pressing position, the second pressing position is adapted to provide a pressing force in the horizontal direction to the battery cell, and the second pressing block structure has a second light-transmitting area corresponding to the second pressing position.

[0017] Beneficial effects: With the cooperation of the first pressing mechanism and the second pressing mechanism, the lamination of the Mylar film corresponding to different surfaces of the battery cell and the battery top cover is realized, and the laser is used to weld the Mylar film and the battery top cover.

[0018] In an alternative embodiment, the first pressing mechanism further includes a first supporting structure, and the first pressing block structure is disposed on the first supporting structure; and / or, the second pressing mechanism further includes a second supporting structure, and the second pressing block structure is disposed on the second supporting structure.

[0019] In an alternative embodiment, the first pressing block structure includes a first pressing block body, the first pressing block body is connected to the first supporting structure, and the first pressing block body is provided with one or a plurality of them arranged in the horizontal direction; and / or, the second pressing block structure includes a second pressing block body, the second pressing block body is connected to the second supporting structure, and the second pressing block body is provided with one or a plurality of them arranged in the vertical direction.

[0020] In an alternative embodiment, the first pressing block body includes a first fixing portion, a first pressing head, and a first elastic member. The first fixing portion is connected to the first supporting structure. The first pressing head is movably disposed in the first fixing portion in the vertical direction. The first elastic member is disposed between the first fixing portion and the first pressing head. The first elastic member is adapted to apply an elastic force in the vertical direction to the first pressing head. The first pressing head extends out of the first fixing portion to form the first pressing position; and / or, the second pressing block body includes a second fixing portion, a second pressing head, and a second elastic member. The second fixing portion is connected to the second supporting structure. The second pressing head is movably disposed in the second fixing portion in the horizontal direction. The second elastic member is disposed between the second fixing portion and the second pressing head. The second elastic member is adapted to apply an elastic force in the horizontal direction to the second pressing head. The second pressing head extends out of the second fixing portion to form the second pressing position.

[0021] Beneficial effects: The first pressing head and / or the second pressing head can elastically press on the Mylar film and the battery top cover, while ensuring that the Mylar film is flatly pressed on the battery top cover, reducing the pressing damage to the Mylar film.

[0022] In an alternative embodiment, the first fixing portion is provided with a first light-transmitting hole. The first pressing head is a light-transmitting structure. The first light-transmitting hole is communicated with the first pressing head to form the first light-transmitting area; and / or, the second fixing portion is provided with a second light-transmitting hole. The second pressing head is a light-transmitting structure. The second light-transmitting hole is communicated with the second pressing head to form the second light-transmitting area.

[0023] Beneficial effects: The laser can pass through the first light-transmitting hole and then be transmitted to the Mylar film through the light-transmitting first pressing head. Therefore, the laser welding machine can weld the Mylar film and the battery top cover at the position of the first light-transmitting hole, realizing the positioning welding of the Mylar film and the battery top cover; and / or, the laser can pass through the second light-transmitting hole and then be transmitted to the Mylar film through the light-transmitting second pressing head. Therefore, the laser welding machine can weld the Mylar film and the battery top cover at the position of the second light-transmitting hole, realizing the positioning welding of the Mylar film and the battery top cover.

[0024] In an alternative embodiment, the first pressing mechanism further includes a vertical driving structure, and the vertical driving structure is in transmission connection with the first supporting structure; and / or, the second pressing mechanism further includes a horizontal driving structure, and the horizontal driving structure is in transmission connection with the second supporting structure.

[0025] In an alternative embodiment, the laser welding device further includes a frame, and both the first pressing mechanism and the driving structure are disposed on the frame. Brief Description of the Drawings

[0026] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 It is a schematic structural diagram of a laser welding device cooperating with an electric core and a battery top cover according to an embodiment of the present invention;

[0028] Figure 2 It is a schematic structural diagram of a laser welding device at an angle according to an embodiment of the present invention;

[0029] Figure 3 For Figure 2 It is a schematic structural diagram of the laser welding device shown at another angle;

[0030] Figure 4 It is a schematic structural diagram of the first pressing block body according to an embodiment of the present invention;

[0031] Figure 5 For Figure 4 It is an exploded structural diagram of the first pressing block body shown;

[0032] Explanation of the Reference Numerals in the Drawings:

[0033] 1. First pressing mechanism; 11. First pressing block structure; 111. First pressing block body; 1111. First fixing part; 11111. First light-transmitting hole; 11112. Installation groove; 1112. First pressing head; 11121. Block body; 11122. Head end; 1113. First elastic member; 1114. Sealing plate; 12. First supporting structure; 13. Vertical driving structure; 2. Laser; 3. Driving structure; 4. Installation structure; 41. Connecting part; 42. First supporting leg; 43. Second supporting leg; 5. Frame. Detailed Description of the Embodiments

[0034] In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0035] Combine the following Figures 1 to 5 , describing an embodiment of the utility model.

[0036] According to an embodiment of the utility model, a laser welding device is provided, comprising: a first pressing mechanism 1, a laser 2 and a driving structure 3. The first pressing mechanism 1 comprises a first pressing block structure 11, the first pressing block structure 11 is formed with a first pressing position, and the first pressing position is suitable for providing a vertical pressing force to the battery cell. The first pressing block structure 11 has a first light-transmitting area, and the first light-transmitting area corresponds to the first pressing position. The laser 2 is arranged on the side of the first pressing block structure 11 away from the first pressing position, and the laser 2 is suitable for emitting laser to the first pressing block structure 11 and transmitting to the first pressing position through the first light-transmitting area. The driving structure 3 is suitable for driving the laser 2 to move.

[0037] The Mylar film is pressed onto the battery top cover by the first pressing block structure 11, and the laser is emitted to the first pressing block structure 11 by the laser 2. The laser can pass through the first light-transmitting area and be emitted from the first pressing position of the first pressing block structure 11 to laser weld the Mylar film and the battery top cover. The driving structure 3 can drive the laser 2 to move, so that the Mylar film and the battery top cover can be welded at multiple different positions. Therefore, in this embodiment, the Mylar film and the battery top cover are connected by laser welding, which has the advantages of high work efficiency, precise and controllable welding process, and low production cost.

[0038] It is worth mentioning that please refer to Figure 1 In this embodiment, the battery cell is in a flat position, that is, the large surface of the battery cell is arranged in the horizontal direction, and the two large surfaces of the battery cell are located at the upper and lower sides respectively. When laser welding is performed, the battery cell and the battery top cover are in a predetermined position. At this time, the first pressing block structure 11 presses the Mylar film above the battery cell and the battery top cover to fit the battery top cover, and the laser 2 welds the Mylar film corresponding to the large surface of the upper side of the battery cell to the battery top cover above the first pressing block structure 11. Alternatively, when laser welding is performed, the battery cell and the battery top cover are in a predetermined position. At this time, the first pressing block structure 11 presses the Mylar film below the battery cell and the battery top cover to fit the battery top cover, and the laser 2 welds the Mylar film corresponding to the large surface of the lower side of the battery cell to the battery top cover below the first pressing block structure 11.

[0039] Specifically, in this embodiment, Figures 1 to 3As shown, there are two first pressing mechanisms 1. The two first pressing blocks 11 of the two first pressing mechanisms 1 are arranged at intervals relative to each other in the vertical direction, so that the two first pressing positions of the two first pressing blocks 11 are arranged at intervals relative to each other and form a pressing space, and at least one first pressing block 11 is movably arranged in the vertical direction. That is to say, the battery cell and the battery top cover are clamped and fixed between the two first pressing blocks 11. With such a setting, the two first pressing mechanisms 1 are used to press the Mylar film and the battery top cover on the opposite sides of the battery cell, and then cooperate with the laser 2 to realize the welding of the Mylar film and the battery top cover on the opposite sides of the battery cell, improving the welding efficiency.

[0040] It should be noted that, please refer to Figure 1 , the two first pressing mechanisms 1 are symmetrically arranged in the vertical direction.

[0041] Furthermore, in this embodiment, both of the two first pressing blocks 11 are movably arranged in the vertical direction. Specifically, the battery cell and the battery top cover are conveyed to a predetermined position by a manipulator or other external driving device, so that the positions to be welded of the Mylar film and the battery top cover are within the pressing space between the two first pressing blocks 11. The first pressing block 11 located above moves downward to press the Mylar film on the battery top cover above the battery cell and the battery top cover, and the first pressing block 11 located below moves upward to press the Mylar film on the battery top cover below the battery cell and the battery top cover.

[0042] Of course, in other alternative embodiments, only the upper first pressing block structure 11 may be movably arranged in the vertical direction, while the position of the lower first pressing block structure 11 is fixed. Specifically, the battery cell and the battery top cover are conveyed to a predetermined position by a manipulator or other external driving device, so that the welding positions of the Mylar film and the battery top cover are within the pressing space between the two first pressing block structures 11. At this time, the Mylar film corresponding to the large surface on the lower side of the battery cell is attached to the first pressing position of the lower first pressing block structure 11. Then, the upper first pressing block structure 11 moves downward, so that the Mylar film corresponding to the large surface on the upper side of the battery cell is attached to the first pressing position of the upper first pressing block structure 11, and under the force applied by the upper first pressing block structure 11, the upper first pressing block structure 11 presses the Mylar film against the battery top cover above the battery cell and the battery top cover, and the lower first pressing block structure 11 presses the Mylar film against the battery top cover below the battery cell and the battery top cover. Or, only the lower first pressing block structure 11 may be movably arranged in the vertical direction, while the position of the upper first pressing block structure 11 is fixed. Specifically, the battery cell and the battery top cover are conveyed to a predetermined position by a manipulator or other external driving device, so that the welding positions of the Mylar film and the battery top cover are within the pressing space between the two first pressing block structures 11. At this time, the Mylar film corresponding to the large surface on the upper side of the battery cell is attached to the first pressing position of the upper first pressing block structure 11. Then, the lower first pressing block structure 11 moves upward, so that the Mylar film corresponding to the large surface on the lower side of the battery cell is attached to the first pressing position of the lower first pressing block structure 11, and under the force applied by the lower first pressing block structure 11, the lower first pressing block structure 11 presses the Mylar film against the battery top cover below the battery cell and the battery top cover, and the upper first pressing block structure 11 presses the Mylar film against the battery top cover above the battery cell and the battery top cover.

[0043] Correspondingly, in this embodiment, as Figures 1 to 3 shown, there are two lasers 2, and the two lasers 2 are respectively arranged corresponding to the two first pressing mechanisms 1, and the driving structure 3 is adapted to drive the two lasers 2 to move in the horizontal direction.

[0044] In other alternative embodiments, under the drive of the driving structure 3, the laser 2 can also move in other directions, such as moving around the pressing block structure, and only need to emit laser at an appropriate position to realize the welding of the Mylar film and the battery top cover.

[0045] In this embodiment, as Figures 1 to 3As shown, the laser welding device further includes a mounting structure 4, and both of the two lasers 2 are disposed on the mounting structure 4, and the driving structure 3 is in transmission connection with the mounting structure 4. With such an arrangement, when the driving structure 3 drives the mounting structure 4 to move horizontally, the two lasers 2 can be simultaneously driven to move horizontally, and the two lasers 2 can respectively weld the Mylar film and the battery top cover on both sides of the battery cell, improving the welding efficiency.

[0046] Further, as Figures 1 to 3 shown, the mounting structure 4 includes a connecting portion 41, a first support leg 42, and a second support leg 43. The connecting portion 41 is connected to the driving structure 3, and the first support leg 42 and the second support leg 43 are vertically disposed on opposite sides of the connecting portion 41, and the two lasers 2 are respectively connected to the first support leg 42 and the second support leg 43. Specifically, please refer to Figure 3 , the mounting structure 4 is a T-shaped plate body.

[0047] Further, the driving structure 3 is a linear module.

[0048] It should be noted that in other alternative embodiments, the number of lasers 2 can also be set to more than two, such as three, four, etc. All the lasers 2 are respectively arranged corresponding to the two first pressing mechanisms 1, and each first pressing mechanism 1 corresponds to at least one laser 2, and the driving structure 3 is adapted to drive each laser 2 to move. Or, the laser 2 can also be set to one, and the driving structure 3 is adapted to drive the laser 2 to move around the two first pressing block structures 11.

[0049] It should be further noted that in other alternative embodiments, the driving structure 3 includes at least two driving units, and the at least two driving units are arranged corresponding to the at least two lasers 2, and each driving unit is in transmission connection with at least one laser 2. For example, two lasers 2 are provided, and two driving units are also provided. The two driving units are respectively used to drive the two lasers 2 to move; or, four lasers 2 are provided, and the driving units can be set to two, and each driving unit is used to drive the two lasers 2 to move synchronously.

[0050] As an alternative embodiment, the first pressing mechanism 1 can also be set to one, that is, the Mylar film is pressed onto the battery top cover on one side of the battery cell.

[0051] When the first pressing mechanism 1 is provided as one, in the first implementation mode, along the vertical direction, an electrode core loading position is formed opposite to the first pressing position; the first pressing block structure 11 is adapted to approach or move away from the electrode core loading position along the vertical direction, and / or, the electrode core at the electrode core loading position is adapted to approach or move away from the first pressing position under the drive of an external driving device. Specifically, the electrode core and the battery top cover are conveyed to the electrode core loading position by a manipulator or other external driving device, and the first pressing block structure 11 is made to approach the electrode core loading position so that the first pressing block structure 11 presses the Mylar film onto the battery top cover; or, the electrode core and the battery top cover are conveyed to the electrode core loading position by a manipulator or other external driving device, and the electrode core and the battery top cover are driven to approach the first pressing position by a manipulator or other external driving device, and under the force applied by the manipulator or other external driving device, the first pressing block structure 11 presses the Mylar film onto the battery top cover; or, the electrode core and the battery top cover are conveyed to the electrode core loading position by a manipulator or other external driving device, and at the same time the first pressing block structure 11 is made to approach the electrode core loading position and the electrode core and the battery top cover are driven to approach the first pressing position by a manipulator or other external driving device, so that the first pressing block structure 11 presses the Mylar film onto the battery top cover.

[0052] Furthermore, the electrode core at the electrode core loading position is adapted to be flipped under the drive of an external driving device so that different surfaces of the electrode core face the first pressing position. That is to say, after the welding of the Mylar film on one side and the battery top cover is completed, the electrode core and the battery top cover can be flipped by a manipulator or other external driving device so that the Mylar film on the other side corresponds to the first pressing structure and welding is carried out again. It should be noted that after the welding of the Mylar film on one side and the battery top cover is completed, the electrode core and the battery top cover can be flipped by 90° to weld the Mylar film and the battery top cover on the adjacent side, or the electrode core and the battery top cover can also be flipped by 180° to weld the Mylar film and the battery top cover on the opposite side.

[0053] When the first pressing mechanism 1 is provided as one, in the second implementation mode, the laser welding device further includes an electrode core fixing mechanism, and the first pressing mechanism 1 is arranged above or below the electrode core fixing mechanism so that the first pressing position and the electrode core fixing mechanism are arranged at an interval relative to each other to form a pressing space, and the electrode core fixing mechanism and / or the first pressing block structure 11 are / is movably arranged along the vertical direction.

[0054] Specifically, in the above second embodiment, the battery cell fixing mechanism includes a tray structure, and the first pressing mechanism 1 is arranged above the tray structure. Therefore, the battery cell and the battery top cover are arranged on the tray structure, so that the first pressing block structure 11 presses the Mylar film above the battery cell and the battery top cover. Further, the tray structure can be arranged to be movable in the vertical direction, or the first pressing block structure 11 can be arranged to be movable in the vertical direction, or both the tray structure and the first pressing block structure 11 can be arranged to be movable in the vertical direction.

[0055] Alternatively, in the above second embodiment, the battery cell fixing mechanism includes a hoisting structure, and the first pressing mechanism 1 is arranged below the hoisting structure. Therefore, the battery cell and the battery top cover are hoisted by the hoisting structure, so that the first pressing block structure 11 presses the Mylar film below the battery cell and the battery top cover. Further, the hoisting structure can be arranged to be movable in the vertical direction, or the first pressing block structure 11 can be arranged to be movable in the vertical direction, or both the hoisting structure and the first pressing block structure 11 can be arranged to be movable in the vertical direction.

[0056] It should be noted that, in the above second embodiment, the laser 2 is correspondingly arranged with the first pressing block structure 11. After using the laser 2 to weld the Mylar film and the battery top cover on one side of the battery cell, the battery cell and the battery top cover on the battery cell fixing mechanism can be flipped to weld the Mylar film and the battery top cover on the remaining sides of the battery cell. Further, the battery cell and the battery top cover can be directly flipped by the battery cell fixing mechanism, or other mechanisms can be additionally arranged to flip the battery cell and the battery top cover.

[0057] In one embodiment, as Figures 1 to 3 shown, the first pressing mechanism 1 further includes a first support structure 12, and the first pressing block structure 11 is arranged on the first support structure 12.

[0058] Further, as Figures 1 to 3 shown, the first pressing block structure 11 includes a first pressing block body 111. The first pressing block body 111 is connected to the first support structure 12, and the first pressing block body 111 is provided with one or several arranged in the horizontal direction.

[0059] Specifically, as Figure 4 and Figure 5As shown in the figure, the first pressing block body 111 includes a first fixing part 1111, a first pressing head 1112 and a first elastic member 1113. The first fixing part 1111 is connected to the first supporting structure 12. The first pressing head 1112 is movably arranged in the vertical direction on the first fixing part 1111. The first elastic member 1113 is arranged between the first fixing part 1111 and the first pressing head 1112. The first elastic member 1113 is adapted to apply an elastic force in the vertical direction to the first pressing head 1112. The first pressing head 1112 extends out of the first fixing part 1111 to form a first pressing position. With such an arrangement, the first pressing head 1112 can elastically press on the Mylar film and the battery top cover, while ensuring that the Mylar film is flatly pressed on the battery top cover, and reducing the pressing damage to the Mylar film.

[0060] Further, as Figure 5 shown, the first fixing part 1111 is provided with an installation groove 11112. The first pressing head 1112 includes a connected block body 11121 and a head end 11122. The block body 11121 is arranged in the installation groove 11112, and the head end 11122 extends out of the installation groove 11112. The block body 11121 has a certain margin of movement in the vertical direction in the installation groove 11112, so that the first pressing head 1112 can move in the vertical direction. The first pressing block body 111 further includes a sealing plate 1114. The sealing plate 1114 is connected to the first fixing part 1111 and seals the installation groove 11112 to cover the block body 11121.

[0061] It should be noted that, please refer to Figures 1 to 3 , in this embodiment, a plurality of first pressing block bodies 111 are arranged in the horizontal direction. The first pressing heads 1112 of each first pressing block body 111 can elastically press on the Mylar film and the battery top cover. The first pressing heads 1112 of the plurality of first pressing block bodies 111 can respectively press different positions of the Mylar film and the battery top cover, and are adapted to the shape of the battery top cover, so as to ensure that the Mylar film can be flatly pressed on the battery top cover.

[0062] It should be noted that the first elastic member 1113 can be a spring, or a rubber rod, or a silica gel rod, etc. The first pressing head 1112 can be made of glass material.

[0063] In one embodiment, as Figure 4 and Figure 5As shown, a first light-transmitting hole 11111 is formed in the first fixing part 1111. The first pressing head 1112 is a light-transmitting structure. The first light-transmitting hole 11111 is communicated with the first pressing head 1112 to form a first light-transmitting area. With such a setting, the laser can pass through the first light-transmitting hole 11111 and then be transmitted to the Mylar film through the light-transmitting first pressing head 1112. Therefore, the laser device 2 can weld the Mylar film and the battery top cover at the position of the first light-transmitting hole 11111, realizing the positioning welding of the Mylar film and the battery top cover.

[0064] It is worth noting that the first light-transmitting hole 11111 is communicated with the mounting groove 11112 so that the laser enters the first pressing head 1112 after passing through the first light-transmitting hole 11111.

[0065] In one embodiment, as Figures 1 to 3 shown, the first pressing mechanism 1 further includes a vertical driving structure 13, and the vertical driving structure 13 is in transmission connection with the first supporting structure 12. Further, the vertical driving structure 13 is a cylinder. By driving the first supporting structure 12 to move in the vertical direction through the vertical driving structure 13, the first pressing block structure 11 can be driven to move synchronously in the vertical direction.

[0066] In one embodiment, as Figures 1 to 3 shown, the laser welding device further includes a frame 5, and the first pressing mechanism 1 and the driving structure 3 are both arranged on the frame 5. Specifically, in this embodiment, as Figures 1 to 3 shown, the driving structure 3 extends in the horizontal direction. The driving structure 3 is connected to the middle position of the frame 5 in the vertical direction. The two vertical driving structures 13 of the two first pressing mechanisms 1 are arranged on the opposite sides of the driving structure 3 in the vertical direction.

[0067] When using the laser welding device of this embodiment, first, the battery cell and the battery top cover are conveyed to a predetermined position so that the positions to be welded of the Mylar film and the battery top cover are within the pressing space between the two first pressing block structures 11; then, the two first pressing block structures 11 are respectively driven by the two vertical driving structures 13 to approach each other, so that the upper first pressing block structure 11 presses the Mylar film against the battery top cover above the battery cell and the battery top cover, and the lower first pressing block structure 11 presses the Mylar film against the battery top cover below the battery cell and the battery top cover; finally, the driving structure 3 drives the mounting structure 4 to move in the horizontal direction, so that the two laser devices 2 move in the horizontal direction. The laser emitted by the laser device 2 can pass through the first light-transmitting hole 11111 and then be transmitted to the Mylar film through the light-transmitting first pressing head 1112 to weld the Mylar film and the battery top cover.

[0068] It should be noted that the Mylar films located at the two small surfaces of the battery cell can also be welded to the battery top cover. The welding can be carried out additionally in this process or transferred to a subsequent process. If the welding is carried out in this process, the laser welding device may further include a second pressing mechanism. The second pressing mechanism includes a second pressing block structure which forms a second pressing position. The second pressing position is adapted to provide a horizontal pressing force to the battery cell. The second pressing block structure has a second light-transmitting area which corresponds to the second pressing position. That is, the Mylar film corresponding to the small surface of the battery cell is pressed against the battery top cover by using the second pressing mechanism. With such an arrangement, under the cooperation of the first pressing mechanism 1 and the second pressing mechanism, the Mylar films corresponding to different surfaces of the battery cell are pressed against the battery top cover, and the Mylar film and the battery top cover are welded by the laser 2.

[0069] Furthermore, the second pressing mechanism further includes a second supporting structure, and the second pressing block structure is arranged on the second supporting structure. The second pressing block structure includes a second pressing block body which is connected to the second supporting structure. The second pressing block body is provided with one or several arranged vertically. The second pressing block body includes a second fixing part, a second pressing head and a second elastic member. The second fixing part is connected to the second supporting structure. The second pressing head is movably arranged horizontally on the second fixing part. The second elastic member is arranged between the second fixing part and the second pressing head. The second elastic member is adapted to apply a horizontal elastic force to the second pressing head. The second pressing head extends out of the second fixing part to form the second pressing position. The second fixing part is provided with a second light-transmitting hole. The second pressing head is a light-transmitting structure. The second light-transmitting hole is communicated with the second pressing head to form the second light-transmitting area. The second pressing mechanism further includes a horizontal driving structure which is in transmission connection with the second supporting structure.

[0070] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A laser welding device, characterized in that, include: A first pressing mechanism (1), comprising a first pressing block structure (11), wherein the first pressing block structure (11) is formed with a first pressing position, wherein the first pressing position is suitable for providing a vertical pressing force to the battery cell, and wherein the first pressing block structure (11) has a first light-transmitting area, wherein the first light-transmitting area corresponds to the first pressing position; A laser (2) is arranged on a side of the first pressing block structure (11) away from the first pressing position, and the laser (2) is suitable for emitting laser light toward the first pressing block structure (11) and transmitting the laser light to the first pressing position through the first light-transmitting area; A driving structure (3) is suitable for driving the laser (2) to move.

2. The laser welding device according to claim 1, wherein, Two of the first pressing mechanisms (1) are provided, and the first pressing block structures (11) of the two first pressing mechanisms (1) are arranged relatively spaced apart in the vertical direction, so that the first pressing positions of the two first pressing block structures (11) are arranged relatively spaced apart and form a pressing space, wherein at least one of the first pressing block structures (11) is movably arranged in the vertical direction.

3. The laser welding device according to claim 2, wherein, At least two lasers (2) are provided, and the at least two lasers (2) are respectively provided corresponding to the two first pressing mechanisms (1), and each of the first pressing mechanisms (1) corresponds to at least one laser (2), and the driving structure (3) is suitable for driving each of the lasers (2) to move at least in a horizontal direction.

4. The laser welding device according to claim 3, characterized in that, The laser welding device further comprises a mounting structure (4), each of the lasers (2) is arranged on the mounting structure (4), and the driving structure (3) is transmission-connected to the mounting structure (4); or, The driving structure (3) comprises at least two driving units, the at least two driving units are arranged corresponding to at least two lasers (2), and each of the driving units is connected in transmission to at least one of the lasers (2).

5. The laser welding device according to claim 2, characterized in that, The laser (2) is provided with a driving structure (3) suitable for driving the laser (2) to move around the two first pressure block structures (11).

6. The laser welding device according to claim 1, characterized in that, In the vertical direction, a battery cell loading position is formed opposite to the first pressing position; the first pressing block structure (11) is suitable for approaching or moving away from the battery cell loading position in the vertical direction, and / or the battery cell at the battery cell loading position is suitable for approaching or moving away from the first pressing position under the drive of an external driving device.

7. The laser welding device according to claim 6, wherein, The battery cell at the battery cell upper position is suitable for being turned over under the drive of an external driving device so that different surfaces of the battery cell face the first pressing position.

8. The laser welding device according to claim 1, wherein The laser welding device also includes a battery cell fixing mechanism, the first pressing mechanism (1) is arranged above or below the battery cell fixing mechanism, so that the first pressing position and the battery cell fixing mechanism are arranged relative to each other and form a pressing space, and the battery cell fixing mechanism and / or the first pressing block structure (11) are movably arranged in a vertical direction.

9. The laser welding device according to claim 8, characterized in that, The battery cell fixing mechanism is suitable for driving the battery cell to flip so that different surfaces of the battery cell face the first pressing position.

10. The laser welding device according to any one of claims 1 to 9, characterized in that, The laser welding device further includes a second pressing mechanism, the second pressing mechanism includes a second pressing block structure, the second pressing block structure forms a second pressing position, the second pressing position is adapted to provide a horizontal pressing force to the battery cell, the second pressing block structure has a second light-transmitting area, and the second light-transmitting area corresponds to the second pressing position.

11. The laser welding device according to claim 10, characterized in that, The first pressing mechanism (1) further includes a first supporting structure (12), and the first pressing block structure (11) is arranged on the first supporting structure (12); and / or, The second pressing mechanism further includes a second supporting structure, and the second pressing block structure is arranged on the second supporting structure.

12. The laser welding device according to claim 11, wherein, The first pressing block structure (11) includes a first pressing block body (111), the first pressing block body (111) is connected to the first supporting structure (12), and the first pressing block body (111) is provided with one or a plurality of arranged along the horizontal direction; and / or, The second pressing block structure includes a second pressing block body, the second pressing block body is connected to the second supporting structure, and the second pressing block body is provided with one or a plurality of arranged along the vertical direction.

13. The laser welding device according to claim 12, characterized in that, The first pressing block body (111) includes a first fixing portion (1111), a first pressing head (1112) and a first elastic member (1113), the first fixing portion (1111) is connected to the first supporting structure (12), the first pressing head (1112) is movably arranged along the vertical direction on the first fixing portion (1111), the first elastic member (1113) is arranged between the first fixing portion (1111) and the first pressing head (1112), the first elastic member (1113) is adapted to apply an elastic force along the vertical direction to the first pressing head (1112), and the first pressing head (1112) extends out of the first fixing portion (1111) to form the first pressing position; and / or, The second pressing block body includes a second fixing portion, a second pressing head and a second elastic member, the second fixing portion is connected to the second supporting structure, the second pressing head is movably arranged along the horizontal direction on the second fixing portion, the second elastic member is arranged between the second fixing portion and the second pressing head, the second elastic member is adapted to apply an elastic force along the horizontal direction to the second pressing head, and the second pressing head extends out of the second fixing portion to form the second pressing position.

14. The laser welding device according to claim 13, wherein The first fixing portion (1111) is provided with a first light-transmitting hole (11111), the first pressing head (1112) is a light-transmitting structure, and the first light-transmitting hole (11111) is communicated with the first pressing head (1112) to form the first light-transmitting area; and / or, The second fixing portion is provided with a second light-transmitting hole, the second pressing head is a light-transmitting structure, and the second light-transmitting hole is communicated with the second pressing head to form the second light-transmitting area.

15. The laser welding device according to claim 11, wherein, The first pressing mechanism (1) further includes a vertical driving structure (13), and the vertical driving structure (13) is in transmission connection with the first supporting structure (12); and / or, The second pressing mechanism further includes a horizontal driving structure, and the horizontal driving structure is in transmission connection with the second supporting structure.

16. The laser welding device according to any one of claims 1 to 9, characterized in that, The laser welding device further includes a frame (5), and both the first pressing mechanism (1) and the driving structure (3) are arranged on the frame (5).

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