An ultrasonic welding device for lithium battery tabs

Abstract

The utility model provides a kind of lithium battery tab ultrasonic welding device, belong to new energy battery manufacturing technical field. Including base and crimping part, base is provided with placing table and the battery cell placing bin located placing table side, the opening towards placing table is arranged in one end of battery cell placing bin, and the other end is rotatably connected with base;Crimping part is set in the upper of placing table, and the side of crimping part close to battery cell placing bin is provided with the end surface of the adhesion inclined towards the center of placing table. Using the lithium battery tab ultrasonic welding device can solve the technical problem of low processing yield caused by the defects of existing lithium battery tab ultrasonic welding means.

Description

Technical Field

[0001] This utility model relates to the field of new energy battery manufacturing technology, and in particular to an ultrasonic welding device for lithium battery tabs. Background Technology

[0002] Lithium-ion batteries, due to their high energy density, long cycle life, and low self-discharge rate, have become the core power source for electric vehicles, energy storage systems, and portable electronic devices. In practical applications, individual battery cells need to be combined into battery modules by connecting them in series to increase voltage and in parallel to expand capacity, in order to meet the power and energy requirements of different scenarios. In this process, the reliable welding of the cell tabs to the metal connecting pieces is a key technical step to ensure the electrical conductivity stability and mechanical integrity of the battery pack.

[0003] In related technologies, ultrasonic welding technology is currently widely used in the industry to connect the electrode tabs and the connecting pieces. In specific operations, aluminum / copper electrode tabs of the battery cell are typically stacked and extended to cover the nickel sheet or copper-aluminum composite connecting piece. Then, a rigid pressure plate is used to press down to make the electrode tabs and the connecting piece fit together. Finally, high-frequency vibration is applied by an ultrasonic welding head to complete the welding.

[0004] The welding method used in related technologies is limited by the cell spacing, preventing the pressure plate from completely covering the protruding end face of the tab. This results in gaps between the tab edge and the pressure plate. During the pressing process, pressure is concentrated at the end of the tab, causing only a localized area at the end of the tab to weld to the connecting piece, while the middle and front sections near the cell are not subjected to pressure, resulting in incomplete or weak connections. The areas not covered by the pressure plate form hollow gaps. In the subsequent module adhesive fixing process, the tape shrinkage force directly acts on the unwelded suspended tabs, causing the upper tabs to tear or even break, leading to low processing yield. Utility Model Content

[0005] This utility model provides an ultrasonic welding device for lithium battery tabs, which can solve the technical problem of low processing yield caused by the defects of existing ultrasonic welding methods for lithium battery tabs. The technical solution is as follows: This utility model provides an ultrasonic welding device for lithium battery tabs, including: a base and a pressing part. The base is provided with a placement platform and a battery cell placement compartment located next to the placement platform. One end of the battery cell placement compartment is provided with an opening facing the placement platform, and the other end is rotatably connected to the base. The crimping part is vertically and flexibly disposed above the placement platform, and the side of the crimping part near the cell placement compartment is provided with a fitting end face that is inclined toward the center of the placement platform.

[0006] Optionally, two cell placement compartments are provided and symmetrically arranged on both sides of the placement platform, and the mating end faces are provided on the opposite sides of the pressing part.

[0007] Optionally, the crimping part includes two crimping blocks, the two crimping blocks are configured with an adjustable distance in the horizontal direction, and the mating end faces are provided on the two sides of the two crimping blocks that are far apart from each other.

[0008] Optionally, an elastic element is provided between the two pressing blocks.

[0009] Optionally, a drive assembly is provided on the side of the placement platform, including a vertically arranged telescopic cylinder and a connecting plate disposed on the top of the telescopic end of the telescopic cylinder. The connecting plate is provided with a horizontally arranged slide rail, and the two pressing blocks are slidably connected to the slide rail through a sliding groove provided on the side.

[0010] Optionally, the driving assembly is provided on both sides of the placement platform, and the sliding groove is provided on both sides of the pressing block.

[0011] Optionally, the telescopic cylinder is a pneumatic cylinder or an electric cylinder.

[0012] Optionally, both pressing blocks are provided with ultrasonic welding holes.

[0013] Optionally, the cell placement compartment is hinged to the base via a rotating shaft fitted with a torsion spring.

[0014] Optionally, the cell placement compartment may have a removable mat with padding on the side away from the opening.

[0015] The beneficial effects of the technical solution provided by this utility model embodiment include at least the following: The ultrasonic welding device for lithium battery tabs provided in this embodiment utilizes a platform of a certain height to support the connecting piece. A rotatable cell placement chamber adjusts the orientation of the cell to be welded. Finally, a pressing part is used to press and fix the tab and connecting piece, achieving pre-ultrasonic welding positioning. While the bottom pressing end face of the pressing part presses down on the tab and connecting piece, the side contacting end face of the pressing part simultaneously fits tightly against the tab lead-out end face of the cell, achieving a convergence effect of multiple tabs. This ensures that while the tabs and connecting piece pressed against the platform are subsequently welded and fixed by the ultrasonic welding head, the remaining tab segments can be fully and tightly fitted, avoiding gaps. This prevents the tape shrinkage force from directly acting on the gapped tab segments during the subsequent module adhesive fixing process, thus avoiding tearing or even breakage of the upper tabs. This effectively solves the technical problem of low processing yield caused by the defects of existing ultrasonic welding methods for lithium battery tabs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional structural schematic diagram of the ultrasonic welding device for lithium battery tabs provided in this embodiment of the utility model; Figure 2 This is a front view structural schematic diagram of the ultrasonic welding device for lithium battery tabs provided in this embodiment of the utility model; Figure 3 This is a partial structural diagram of the ultrasonic welding device for lithium battery tabs provided in this embodiment of the invention, showing the removal of the crimping part. Figure 4 This is an exploded view of the structure of the crimping part provided in an embodiment of this utility model.

[0018] In the diagram: 1-base; 2-crimping part; 2a-fitting end face; 2b-bottom crimping end face; 3-drive assembly; 11-placement platform; 12-cell placement compartment; 21-crimping block; 22-elastic element; 31-telescopic cylinder; 32-connecting plate; 121-rotating shaft; 122-pad; 123-base plate; 124-side plate; 211-slide groove; 212-ultrasonic welding hole; 321-slide rail; m-connecting piece; n-cell; n1-tab. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0020] Figure 1 This is a three-dimensional structural schematic diagram of the ultrasonic welding device for lithium battery tabs provided in this embodiment of the utility model; Figure 2 This is a front view structural schematic diagram of the ultrasonic welding device for lithium battery tabs provided in this embodiment of the utility model; Figure 3 This is a partial structural diagram of the ultrasonic welding device for lithium battery tabs provided in this embodiment of the invention, showing the removal of the crimping part. Figure 4 This is an exploded view of the structure of the crimping part provided in an embodiment of this utility model. Figures 1 to 4 As shown in the figure, this utility model embodiment provides an ultrasonic welding device for lithium battery tabs, including: a base 1 and a pressing part 2.

[0021] The base 1 is provided with a placement platform 11 and a battery cell placement compartment 12 located next to the placement platform 11. One end of the battery cell placement compartment 12 is provided with an opening facing the placement platform 11, and the other end is rotatably connected to the base 1.

[0022] The crimping part 2 is vertically mounted above the placement platform 11, and the side of the crimping part 2 near the cell placement compartment 12 is provided with a mating end face 2a that is inclined toward the center of the placement platform 11.

[0023] In this embodiment of the invention, when ultrasonic welding of lithium battery tabs and connecting pieces is required using the ultrasonic welding device for lithium battery tabs, the connecting piece m can be placed on the placement platform 11, and the battery cell n to be welded can be placed in the battery cell placement chamber 12. Exemplarily, the battery cell placement chamber 12 in this solution is a receiving chamber structure with a top and one side opening, formed by a rectangular base plate 123 and three side plates 124 perpendicularly connected along its edges. Its side opening faces the placement platform 11, while the side away from the placement platform 11 is closed by the side plate 124. The three side plates 124 limit and fix the placed battery cell n, while the tab n1 can extend from its side opening. The other end of the battery cell placement chamber 12 is rotatably connected to the base 1. Before welding, it can be externally adjusted to rotate upwards relative to the base 1 by a certain angle, so that the base plate 123 and the base 1 are arranged at an acute angle and remain stable, lifting the tab n1 extending from the opening of the battery cell placement chamber 12 above the connecting piece m. As the cell placement chamber 12 rotates and tilts, the end face of cell n connected to tab n1 is also tilted and parallel to the contact end face 2a corresponding to the upper pressing part 2. By controlling the pressing part 2 to press down, tab n1 is pressed and fixed onto the connecting piece m. While the bottom pressing end face 2b of the pressing part 2 presses tab n1 and connecting piece m together, the contact end face 2a on the side of the pressing part 2 simultaneously fits tightly against the end face of tab n1 extending from cell n, achieving a convergence effect of multiple tabs n1. This ensures that while the tabs n1 pressed onto the placement platform 11 and the connecting piece m are subsequently welded and fixed using an ultrasonic welding head, the remaining tabs n1 can be fully and tightly attached, avoiding gaps. This prevents the tape shrinkage force from directly acting on the gapped tab segments during the subsequent module adhesive fixing process, thus avoiding tearing or even breakage of the upper tabs. This effectively solves the technical problem of low processing yield caused by defects in existing ultrasonic welding methods for lithium battery tabs.

[0024] For example, Figure 1 and Figure 2 The middle cell n and the tab n1 are simplified structures for demonstrating the processing structure. In actual processing, the core package side end face of a conventional cell n will have two positive and negative tabs n1 arranged side by side. The pressing part 2 and the bonding end face 2a provided in this embodiment of the utility model can also achieve simultaneous pressing and positioning of multiple tabs n1.

[0025] Optionally, two cell placement chambers 12 are provided and symmetrically arranged on both sides of the placement platform 11, and corresponding mating end faces 2a are provided on opposite sides of the crimping part 2. Exemplarily, in this embodiment of the invention, by symmetrically arranging two adjustable cell placement chambers 12 on both sides of the placement platform 11, two cells n that need to be connected in series or parallel can be simultaneously placed in the two cell placement chambers 12. The tabs n1 of both cells extend from both sides above the connecting piece m, and are simultaneously fixed by pressing down with the crimping part 2 and then subjected to subsequent ultrasonic welding, effectively improving processing efficiency.

[0026] Optionally, the crimping part 2 includes two crimping blocks 21, which are configured with an adjustable spacing in the horizontal direction. The two crimping blocks 21 have mating end faces 2a on their mutually distant sides. Exemplarily, in this embodiment of the invention, while simultaneously crimping and pre-positioning the tabs n1 extending from both sides with the connecting piece m, the two adjustable-spacing crimping blocks 21 are paired with the battery cells n and tabs n1 on both sides. During the crimping process, the spacing between the two crimping blocks 21 is adjusted by external means to keep them far apart, ensuring that the mating end faces 2a are fully and tightly fitted to the end faces of the battery cells n on both sides. This further improves the tightness of the fit to the portion of the tabs n1 outside the welding section and reduces the amount of open space.

[0027] Optionally, an elastic element 22 is provided between the two pressing blocks 21. Exemplarily, in one possible implementation of this invention, the two pressing blocks 21 are connected by a horizontally arranged elastic element 22, such as a spring. In the normal extended state, the bottom distance between the contacting end faces 2a of the two pressing blocks 21 is set to be greater than the distance between the two ends of the placement platform 11. When the pressing part 2 is pressed down as a whole, after the two pressing blocks 21 contact the end faces of the battery cells n on both sides through the contacting end faces 2a, they will move closer together under the decompression of the end faces of the battery cells n. At this time, the elastic element 22 between them, after being compressed, will resist under its own elastic force, thereby pressing the pressing blocks 21 on both sides against the battery cells n, ensuring a tight pressing connection.

[0028] For example, in another possible implementation of this utility model, the two pressing blocks 21 can also be driven to extend and retract by an electronic control element such as a drive cylinder to achieve tight contact with the n-side end faces of the battery cells on both sides.

[0029] Optionally, a drive assembly 3 is provided on the side of the placement platform 11, including a vertically arranged telescopic cylinder 31 and a connecting plate 32 disposed on the top of the telescopic end of the telescopic cylinder 31. A horizontally arranged slide rail 321 is provided on the connecting plate 32, and two pressing blocks 21 are slidably connected to the slide rail 321 through a sliding groove 211 provided on the side. Exemplarily, in the utility model embodiment, drive assemblies 3 are provided on opposite sides of the placement platform 11. They use an external host computer or related control device to send control signals to control the telescopic cylinder 31 (which can be a pneumatic cylinder or an electric cylinder, flexibly selected according to the power supply conditions in the actual processing scenario) to drive the telescopic end to extend and retract, so as to drive the connecting plate 32 and the two pressing blocks 21 slidably connected to the connecting plate 32 to rise and fall, thereby realizing the pressing and positioning of the tab n1 and the connecting piece m. By setting the drive components 3 on both sides, the top pressing block 21 can be supported on both sides to ensure stability. The slide rail 321 of the connecting plate 32 cooperates with the slide groove 211 of the pressing block 21 to achieve connection and support, and at the same time, it can also limit and guide the lateral spacing adjustment path of the two pressing blocks 21 to avoid deviation and ensure processing accuracy.

[0030] Optionally, both pressing blocks 21 are provided with ultrasonic welding holes 212. Exemplarily, in one embodiment of this utility model, both pressing blocks 21 are longitudinally perforated with ultrasonic welding holes 212 for the ultrasonic welding head to extend into. After the pressing blocks 21 have completed the pressing and positioning of the electrode n1 and the connecting piece m, the ultrasonic welding head can be driven to extend from top to bottom into the ultrasonic welding holes 212 to weld the lower electrode n1 and connecting piece m, achieving standardized welding positions and further improving overall processing accuracy.

[0031] Optionally, the battery cell placement compartment 12 and the base 1 are hinged via a rotating shaft 121 fitted with a torsion spring. Exemplarily, in this embodiment of the invention, the battery cell placement compartment 12 and the base 1 are rotatably connected via the rotating shaft 121 fitted with a torsion spring. This allows the torsion spring to support and fix the battery cell placement compartment 12, ensuring that it maintains an angled arrangement with the base 1 under normal conditions. After the battery cell n is placed in, subsequent pressing and positioning can be performed directly without additional adjustments.

[0032] For example, in other possible implementations, the rotating shaft 121 can also be directly driven by an external drive device such as a stepper motor, thereby achieving more precise angle adjustment between the cell placement compartment 12 and the base 1.

[0033] Optionally, a pad 122 is provided on the side of the cell placement compartment 12 away from the opening. Exemplarily, in this embodiment of the invention, to accommodate different specifications of cell n, a pad 122 can be added to the inner wall of the closed side plate 124 of the cell placement compartment 12. This ensures that after the cell n is placed, the protruding end face of its tab n1 is positioned precisely at the opening of the cell placement compartment 12, allowing the tab n1 to accurately extend above the connecting piece m. Multiple pads 122 can be provided according to the size of commonly used cell specifications to supplement the padding length, allowing for immediate use and effectively improving the overall adaptability of the device.

[0034] For example, in other possible implementations, the cell placement compartment 12 can also be detachably replaceable with the rotating shaft 121 or the base 1. By pre-setting cell placement compartments 12 with different spacing between side plates 124 on both sides, corresponding to cell n with different widths, the versatility can be further improved.

[0035] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising” or “including” and similar terms mean that the elements or objects preceding “comprising” or “including” encompass the elements or objects listed following “comprising” or “including” and their equivalents, and do not exclude other elements or objects. The terms “connected” or “linked” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0036] The above description is only an optional embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An ultrasonic welding device for lithium battery tabs, characterized in that, include: Base (1) and crimping part (2). The base (1) is provided with a placement platform (11) and a cell placement compartment (12) located next to the placement platform (11). One end of the cell placement compartment (12) is provided with an opening facing the placement platform (11), and the other end is rotatably connected to the base (1). The crimping part (2) is vertically mounted above the placement platform (11), and the crimping part (2) has a mating end face (2a) that is inclined toward the center of the placement platform (11) on the side near the cell placement compartment (12).

2. The ultrasonic welding device for lithium battery tabs according to claim 1, characterized in that, Two battery cell placement compartments (12) are provided and are symmetrically arranged on both sides of the placement platform (11). The bonding end face (2a) is provided on both opposite sides of the crimping part (2).

3. The ultrasonic welding device for lithium battery tabs according to claim 2, characterized in that, The crimping part (2) includes two crimping blocks (21), the two crimping blocks (21) are configured with an adjustable spacing in the horizontal direction, and the mating end faces (2a) are provided on the two sides of the two crimping blocks (21) that are far apart from each other.

4. The ultrasonic welding device for lithium battery tabs according to claim 3, characterized in that, An elastic element (22) is provided between the two pressing blocks (21).

5. The ultrasonic welding device for lithium battery tabs according to claim 3, characterized in that, The placement platform (11) is provided with a drive assembly (3) on the side, including a vertically arranged telescopic cylinder (31) and a connecting plate (32) on the top of the telescopic end of the telescopic cylinder (31). The connecting plate (32) is provided with a horizontally arranged slide rail (321), and the two pressing blocks (21) are slidably connected to the slide rail (321) through the slide groove (211) provided on the side.

6. The ultrasonic welding device for lithium battery tabs according to claim 5, characterized in that, The drive assembly (3) is provided on both sides of the placement platform (11), and the slide groove (211) is provided on both sides of the pressing block (21).

7. The ultrasonic welding device for lithium battery tabs according to claim 5, characterized in that, The telescopic cylinder (31) is a pneumatic cylinder or an electric cylinder.

8. The ultrasonic welding device for lithium battery tabs according to claim 3, characterized in that, Both of the pressing blocks (21) are provided with ultrasonic welding holes (212).

9. An ultrasonic welding apparatus for lithium battery tabs according to any one of claims 1 to 8, characterized in that, The cell placement compartment (12) and the base (1) are hinged together by a rotating shaft (121) fitted with a torsion spring.

10. An ultrasonic welding apparatus for lithium battery tabs according to any one of claims 1 to 8, characterized in that, The cell placement compartment (12) has a removable pad (122) on the side away from the opening.

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