Multi-bump solder post, solder joint assembly, and ultrasonic welding apparatus for semi-solid batteries

Abstract

The disclosure provides a multi-bump welding post for a semi-solid battery, a welding head assembly and an ultrasonic welding device. The multi-bump welding post for the semi-solid battery comprises a welding connecting piece and a welding frustum connected to each other. The welding connecting piece is used to connect with a sliding seat of the welding head assembly, so that the welding connecting piece can move relative to the sliding seat under the action of an external force, so as to realize the insertion and withdrawal of the welding post in the semi-solid cylindrical battery, thereby completing the welding and fixing of the semi-solid cylindrical battery. The multi-bump welding post for the semi-solid battery further comprises a plurality of preset bumps, and each preset bump is arranged on one side of the welding frustum away from the welding connecting piece. The device, the plurality of preset bumps added, not only reduces the risk of false welding of the welding interface, but also improves the welding efficiency.

Description

Technical Field

[0001] This disclosure relates to the field of semi-solid cell welding technology, and in particular to a multi-protrusion weld post, weld head assembly, and ultrasonic welding equipment for semi-solid cells. Background Technology

[0002] In the production process of semi-solid-state batteries, it is usually necessary to weld the tabs of the cell to the current collector. Early welding machines generally used single-pillar planar contact welding posts. For some multi-tab semi-solid-state batteries, the planar contact of a single welding post has the problem of small welding area, resulting in low current carrying capacity and easy occurrence of cold solder joints.

[0003] To address the aforementioned technical issues, a method for welding the negative current collector of a large cylindrical lithium battery, as disclosed in Chinese Patent Document CN119347074A, has emerged. This method primarily designs the welding area of ​​the current collector with a bump-shaped structure, effectively solving the problems of low current carrying capacity and susceptibility to cold solder joints in multi-tab semi-solid-state batteries. Although the bump structure significantly increases the effective welding contact area, the traditional single-pillar planar contact welding method still suffers from limitations in welding efficiency.

[0004] The academic community has further proposed optimization schemes, such as the multi-point welding device for a projection welding machine disclosed in Chinese patent document CN218799777U. According to this document... Figure 1 As shown, although convex contact weld columns can increase the contact area, the effective weld point density per unit welding area is still insufficient, resulting in the risk of incomplete welding at the weld interface. Utility Model Content

[0005] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a multi-protrusion weld post, weld head assembly, and ultrasonic welding equipment for semi-solid batteries that reduces the risk of poor welding at the weld interface and improves welding efficiency.

[0006] The purpose of this disclosure is achieved through the following technical solution:

[0007] A multi-bump weld post for semi-solid-state batteries includes a weld connector and a weld cone connected together, wherein the weld connector is used to connect to a sliding seat of a weld head assembly.

[0008] The multi-bump welding post for the semi-solid battery also includes multiple preset bumps, each of which is disposed on the side of the welding cone facing away from the welding connector.

[0009] In one embodiment, the predetermined protrusions are equidistantly distributed circumferentially along the side of the welding cone facing away from the welding connector; and / or,

[0010] The distance between each adjacent preset protrusion is 0.01mm-100mm; and / or,

[0011] The total area of ​​each of the preset protrusions accounts for 10%-70% of the area of ​​the side of the welding cone facing away from the welding connector.

[0012] In one embodiment, the height of the preset protrusion is 0.01mm-30mm.

[0013] In one embodiment, the height of the preset protrusion is 0.01mm-3.0mm.

[0014] In one embodiment, the preset protrusion is either hemispherical or arc-shaped.

[0015] In one embodiment, the radius of the preset protrusion is 0.01mm-30mm.

[0016] In one embodiment, the width of the welding cone gradually decreases from the end near the welding connector to the end away from the welding connector; and / or,

[0017] The taper of the welding cone is 1°-30°.

[0018] A welding head assembly includes a multi-bump weld post for a semi-solid battery as described in any of the above embodiments and a sliding seat, wherein the sliding seat is detachably connected to a welding connector of the multi-bump weld post for the semi-solid battery.

[0019] In one embodiment, the welding head assembly further includes a mounting plate connected to the sliding seat. The mounting plate has a mounting portion at one end facing the welding connector, and the welding connector has a threaded portion at one end facing the mounting plate, the threaded portion being threadedly connected to the mounting portion.

[0020] An ultrasonic welding apparatus includes the welding head assembly described in any of the above embodiments.

[0021] Compared with the prior art, this disclosure has at least the following advantages:

[0022] 1) Since each of the preset protrusions is located on the side of the welding cone facing away from the welding connector, the additional preset protrusions can further increase the contact area between the tab and the current collector. This ensures that during a single ultrasonic welding operation, multiple preset protrusions can simultaneously weld the contact area between the tab and the current collector of a single semi-solid-state battery multi-protrusion welding column, and simultaneously form multiple welding points at the welding interface. This increases the effective welding point density per unit welding area, thereby improving the weld strength of the welding interface and effectively reducing the risk of incomplete welding at the welding interface. Moreover, compared with traditional single welding columns, the multi-protrusion welding column of this disclosure does not require multiple frequent welding operations, effectively improving welding efficiency.

[0023] 2) In addition, since the welding cone has a certain taper, the welding column can be quickly and smoothly inserted into the welding hole of the semi-solid cylindrical battery, thereby realizing the rapid welding and fixing of the tab and the current collector, which further improves the welding efficiency. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of a multi-bump weld post for a semi-solid battery according to an embodiment of the present invention;

[0026] Figure 2 for Figure 1 The enlarged view shown at point A in the middle;

[0027] Figure 3 This is a schematic diagram of the structure of an ultrasonic welding device according to an embodiment of the present invention from one direction;

[0028] Figure 4 for Figure 3 A magnified view of the area shown at point A in the middle.

[0029] Reference numerals: 1. Ultrasonic welding equipment; 10. Welding head assembly; 20. Ultrasonic transducer; 30. Frame; 100. Multi-protrusion welding column for semi-solid batteries; 110. Welding connector; 111. Threaded connection; 120. Welding cone; 130. Pre-set protrusion; 200. Sliding seat; 300. Mounting plate; 310. Mounting part; 311. Mounting cavity; 312. Threaded hole. Detailed Implementation

[0030] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.

[0031] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0033] To better understand the technical solutions and beneficial effects of this disclosure, the following detailed description is provided in conjunction with specific embodiments:

[0034] Please refer to 1 to Figure 2 In one embodiment, a multi-bump weld post 100 for a semi-solid-state battery includes a weld connector 110 and a weld cone 120 connected together. The weld connector 110 is used to connect with the sliding seat 200 of the weld head assembly 10, so that the weld connector 110 can move relative to the sliding seat 200 under the action of external force, so as to realize the insertion and withdrawal of the weld post in the semi-solid-state cylindrical battery, thereby completing the welding and fixing of the semi-solid-state cylindrical battery. The multi-bump weld post 100 for a semi-solid-state battery also includes a plurality of preset bumps 130, each of the preset bumps 130 being disposed on the side of the weld cone 120 opposite to the weld connector 110.

[0035] It is understood that since each of the preset protrusions 130 is disposed on the side of the welding cone 120 opposite to the welding connector 110, the additional preset protrusions 130 can further increase the contact area between the tab and the current collector, ensuring that when a single semi-solid-state battery multi-protrusion welding post 100 is subjected to a single ultrasonic welding, multiple preset protrusions 130 can simultaneously weld the contact area between the tab and the current collector, and form multiple welding points at the welding interface at the same time, thereby increasing the effective welding point density per unit welding area, thereby improving the welding strength of the welding interface and effectively reducing the risk of incomplete welding at the welding interface; and compared with the traditional single welding post, the multi-protrusion welding post of this disclosure does not need to be welded frequently multiple times, effectively improving welding efficiency.

[0036] In addition, because the welding cone 120 has a certain taper, the welding column can be quickly and smoothly inserted into the welding hole of the semi-solid cylindrical battery, thereby realizing the rapid welding and fixing of the tab and the current collector, which further improves the welding efficiency.

[0037] like Figure 2 As shown, in one embodiment, each of the preset protrusions 130 is equidistantly distributed circumferentially along the side of the welding cone 120 facing away from the welding connector 110, so as to achieve a uniform distribution of each preset protrusion 130, so as to ensure that the multi-protrusion welding post 100 for semi-solid-state batteries can form a uniform welding point at the welding interface after the welding operation is completed, further ensuring the welding strength of the welding interface; and further reducing the risk of poor welding at the welding interface.

[0038] In one embodiment, the spacing between each adjacent preset protrusion 130 is 0.01mm-100mm; in particular, the total area of ​​each preset protrusion 130 occupies 10%-70% of the area of ​​the side of the welding cone 120 facing away from the welding connector 110, to ensure that the distribution density of multiple preset protrusions 130 on the side of the welding cone 120 facing away from the welding connector 110 is appropriate. In this way, the problem of uneven pressure distribution in ultrasonic welding caused by high-density preset protrusions 130, resulting in excessive compression and deformation of the electrode tab, is effectively avoided; at the same time, the problem of low-density preset protrusions 130 making it difficult to form a continuous and dense welding interface is also effectively avoided.

[0039] In one embodiment, the height of the preset bump 130 is 0.01mm-30mm, especially when used in conjunction with the radius of the preset bump 130 being 0.01mm-30mm. This ensures that the size of the preset bump 130 is relatively appropriate, effectively avoiding the problem of the tab being easily compressed and deformed due to the excessive height of the preset bump 130; or effectively avoiding the problem of cold solder joints due to the excessive height of the preset bump 130; or effectively avoiding the problem of cold solder joints due to the excessively large contact area of ​​a single preset bump 130 caused by the excessively large radius of the preset bump 130, resulting in insufficient energy density of a single preset bump 130; and effectively avoiding the problem of microcracks easily appearing at the welding interface due to the excessively small contact area of ​​a single preset bump 130.

[0040] In a preferred embodiment, the height of the preset protrusion 130 is 0.01mm-3.0mm, and the radius of the preset protrusion 130 is 0.01mm-5.0mm.

[0041] It is worth mentioning that, in order to ensure that the multiple preset bumps 130 have good ultrasonic welding energy, the operator can select according to the actual welding needs and experience to ensure that the energy density of the multiple preset bumps 130 is sufficient, thereby effectively ensuring the weld strength of the welding interface.

[0042] In one embodiment, the preset protrusion 130 is either hemispherical or arc-shaped. Because the hemispherical preset protrusion 130 has a symmetrical structure, it allows for uniform diffusion of ultrasonic vibration energy and more uniform distribution of frictional heat, which is beneficial for forming uniform weld points at the welding interface. Because the arc-shaped preset protrusion 130 has linear contact guiding energy transmission along a specific direction, it is beneficial for forming more uniform weld points at the welding interface. Therefore, the hemispherical or arc-shaped preset protrusion 130 can effectively improve the weld strength of the welding interface.

[0043] like Figure 2 As shown, in a preferred embodiment, the preset protrusion 130 is hemispherical.

[0044] In one embodiment, the width of the welding cone 120 gradually decreases from the end near the welding connector 110 to the end away from the welding connector 110, to ensure that the welding post can quickly and smoothly extend into the welding hole of the semi-solid cylindrical battery, thereby achieving rapid welding and fixing of the electrode tab and the current collector, further improving welding efficiency. Specifically, the taper of the welding cone 120 is 1°-30°.

[0045] like Figure 3As shown, this disclosure also provides a welding head assembly 10, including a multi-bump weld post 100 for semi-solid batteries as described in any of the above embodiments and a sliding seat 200. The sliding seat 200 is detachably connected to the welding connector 110 of the multi-bump weld post 100 for semi-solid batteries, so as to realize the detachable connection between the multi-bump weld post 100 for semi-solid batteries and the sliding seat 200. This allows the operator to select the appropriate multi-bump weld post 100 for semi-solid batteries according to actual production needs, thereby improving the adaptability of the multi-bump weld post 100 for semi-solid batteries to welding semi-solid batteries of different specifications.

[0046] like Figure 4 As shown, in one embodiment, the welding head assembly 10 further includes a mounting plate 300, which is connected to the sliding seat 200 to achieve a fixed connection between the mounting plate 300 and the sliding seat 200. A mounting portion 310 is formed at one end of the mounting plate 300 facing the welding connector 110, and a threaded portion 111 is formed at one end of the welding connector 110 facing the mounting plate 300. The threaded portion 111 is threadedly connected to the mounting portion 310 to achieve a detachable threaded connection between the multi-bump weld post 100 for semi-solid-state batteries and the sliding seat 200. Furthermore, the added mounting plate 300 provides a reliable and stable connection force for the multi-bump weld post 100 for semi-solid-state batteries, thereby ensuring the stability of the movement of the multi-bump weld post 100 for semi-solid-state batteries.

[0047] like Figure 4 As shown, in one embodiment, the mounting portion 310 is a mounting ring with a mounting cavity 311 formed inside. The mounting cavity 311 is used to accommodate the vibrating end of the ultrasonic transducer 20. A threaded hole 312 is formed on the surface of the mounting ring facing the multi-protrusion weld post 100 for the semi-solid-state battery. The threaded portion 111 of the welding connector 110 is threaded to the inner wall of the threaded hole 312 to achieve the threaded connection between the welding connector 110 and the mounting plate 300. In one embodiment, the extension direction of the mounting cavity 311 is perpendicular to the extension direction of the threaded hole 312 to ensure that the vibration direction of the ultrasonic transducer 20 is not in the same plane as the threaded direction. This ensures the reliable stability of the multi-protrusion weld post 100 for the semi-solid-state battery during ultrasonic welding and effectively avoids the problem of the multi-protrusion weld post 100 for the semi-solid-state battery easily falling off due to high-frequency vibration during ultrasonic welding.

[0048] It is worth mentioning that the vibrating end of the ultrasonic transducer 20 passes through the mounting cavity 311 and at least partially protrudes from the mounting cavity 311 to achieve a fixed connection between the ultrasonic transducer 20 and the mounting ring. Of course, those skilled in the art can use auxiliary locking structures, such as bolts, to fix the vibrating end of the ultrasonic transducer 20 to the mounting ring. Therefore, this is not described in detail in this disclosure. The focus of this disclosure is on the specially designed structure of the welding column.

[0049] In one embodiment, the welded connector 110 and the threaded portion 111 are integrally formed. The threaded portion 111 protrudes from the welded connector 110.

[0050] In one embodiment, the mounting ring and the welding connector 110 are integrally formed to ensure the robust connection between the welding connector 110, the welding cone 120 and the mounting ring, so as to better adapt to applications under high-frequency ultrasonic vibration conditions.

[0051] like Figure 3 As shown, this disclosure also provides an ultrasonic welding device 1, including the welding head assembly 10 described in any of the above embodiments. The added welding head assembly 10 not only reduces the risk of incomplete welding at the welding interface but also improves welding efficiency and enhances the adaptability of the ultrasonic welding device 1 to welding semi-solid-state batteries of different specifications. The ultrasonic welding device 1 also includes a frame 30, an ultrasonic transducer 20, and a fixing assembly. The welding head assembly 10 is movably mounted on the frame 30 via a sliding seat 200. The fixing assembly is located below the welding head assembly 10 and has a mounting area for fixing the semi-solid-state battery. The vibrating end of the ultrasonic transducer 20 is sleeved and fixed within the mounting portion 310 of the mounting plate 300, achieving a fixed connection between the ultrasonic transducer 20 and the mounting plate 300. The welding post is disposed on the side of the mounting portion 310 facing the mounting area, and the welding post is correspondingly disposed with the welding area of ​​the semi-solid-state battery to achieve ultrasonic welding and fixing of the semi-solid-state battery.

[0052] It is worth noting that the clamping and fixing of the semi-solid battery by the fixing components is prior art, and the sliding seat 200 being movably mounted on the frame 30 is also prior art. Therefore, they are not specifically described in this disclosure. Those skilled in the art can implement them through existing designs.

[0053] Compared with the prior art, this disclosure has at least the following advantages:

[0054] 1) Since each of the preset protrusions 130 is disposed on the side of the welding cone 120 opposite to the welding connector 110, the additional preset protrusions 130 can further increase the contact area between the tab and the current collector, ensuring that when a single semi-solid-state battery multi-protrusion welding post 100 is subjected to a single ultrasonic welding, the multiple preset protrusions 130 can simultaneously weld the contact area between the tab and the current collector, and form multiple welding points at the welding interface at the same time, thereby increasing the effective welding point density per unit welding area, thereby improving the welding strength of the welding interface and effectively reducing the risk of incomplete welding at the welding interface; and compared with the traditional single welding post, the multi-protrusion welding post of this disclosure does not need to be welded frequently multiple times, effectively improving the welding efficiency.

[0055] 2) In addition, since the welding cone 120 has a certain taper, the welding column can be quickly and smoothly inserted into the welding hole of the semi-solid cylindrical battery, thereby realizing the rapid welding and fixing of the tab and the current collector, which further improves the welding efficiency.

[0056] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A multi-bump weld post for semi-solid-state batteries, comprising a weld connector and a weld cone connected together, wherein the weld connector is used to connect to a sliding seat of a weld head assembly, characterized in that, The multi-bump welding post for the semi-solid battery also includes multiple preset bumps, each of which is disposed on the side of the welding cone facing away from the welding connector.

2. The multi-bump weld post for a semi-solid-state battery according to claim 1, characterized in that, Each of the predetermined protrusions is equidistantly distributed circumferentially along the side of the welding cone facing away from the welding connector; and / or, The distance between each adjacent preset protrusion is 0.01mm-100mm; and / or, The total area of ​​each of the preset protrusions accounts for 10%-70% of the area of ​​the side of the welding cone facing away from the welding connector.

3. The multi-bump weld post for a semi-solid-state battery according to claim 1, characterized in that, The height of the preset protrusion is 0.01mm-30mm.

4. The multi-bump weld post for a semi-solid-state battery according to claim 3, characterized in that, The height of the preset protrusion is 0.01mm-3.0mm.

5. The multi-bump weld post for a semi-solid-state battery according to claim 1, characterized in that, The preset protrusion can be either hemispherical or arc-shaped.

6. The multi-bump weld post for a semi-solid-state battery according to claim 5, characterized in that, The radius of the preset protrusion is 0.01mm-30mm.

7. The multi-bump weld post for a semi-solid-state battery according to claim 1, characterized in that, The width of the welding cone gradually decreases from the end closest to the welding connector to the end furthest from the welding connector; and / or, The taper of the welding cone is 1°-30°.

8. A welding head assembly, characterized in that, The invention includes a multi-bump weld post and a sliding seat for a semi-solid-state battery as described in any one of claims 1-7, wherein the sliding seat is detachably connected to a welding connector of the multi-bump weld post for the semi-solid-state battery.

9. The welding head assembly according to claim 8, characterized in that, The welding head assembly further includes a mounting plate, which is connected to the sliding seat. The mounting plate has a mounting portion at one end facing the welding connector, and the welding connector has a threaded portion at one end facing the mounting plate. The threaded portion is threadedly connected to the mounting portion.

10. An ultrasonic welding device, characterized in that, Includes the welding head assembly as described in claim 8 or 9.

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