A lithium ion battery welding head structure

Abstract

The utility model discloses a kind of lithium ion battery welding head structures, it is related to lithium ion battery manufacturing equipment field, including body and the welding spot formed on the body working surface, body is the three prism structure of the cross section is equilateral triangle, welding spot is with the center line of body working surface as reference, offset arrangement towards the same direction, and the offset amount of welding spot on the three working surfaces of body and offset direction are all same.The utility model can adapt the stroke of welding mechanism to complete short tab welding task, and significantly prolong the service life of welding head, improve welding comprehensive efficiency.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion battery manufacturing equipment, and in particular to a lithium-ion battery welding head structure. Background Technology

[0002] With the rapid development of lithium-ion battery technology, lithium-ion batteries have become mainstream energy storage devices. Internally, they mainly consist of components such as a cathode, anode, electrolyte, and separator. The tabs and current collectors are typically connected using ultrasonic welding. The ultrasonic welding process transmits high-frequency vibration waves to the surface of the tabs. Under applied pressure, the tabs and current collectors rub against each other, generating heat and achieving metallurgical bonding between molecular layers. To enhance the frictional heat effect during welding, multiple welding teeth are usually machined on the contact surface between the welding head and the workpiece. Common tooth shapes include round teeth and pointed teeth. The welding head can be designed as a serrated or spherical shape, with the welding teeth evenly distributed on the working surface of the welding head.

[0003] In existing technologies, the welding points of ultrasonic welding heads are typically centrally located, consisting of multiple sub-welding points arranged in rows and columns, with gaps between adjacent sub-welding points. Traditional welding heads are designed with welding teeth evenly distributed on both sides. When a welding point on one side becomes unusable due to wear, it can be flipped over to use the welding points on the other side, allowing a single welding head to have a total of two welding cycles. However, this centrally located welding point design is difficult to adapt to welding scenarios where short tabs cannot be aligned due to the limited travel of the welding mechanism. At the same time, ultrasonic welding heads with only welding points on two sides require frequent replacements in continuous high-intensity production environments, which not only reduces the welding efficiency of the tabs but also restricts the overall battery production rhythm.

[0004] Therefore, how to develop an ultrasonic welding head structure that can adapt to the welding mechanism stroke to complete short tab welding tasks, significantly extend the service life of the welding head, and improve the overall welding efficiency has become a technical problem that urgently needs to be solved by people in this field. Utility Model Content

[0005] The purpose of this invention is to provide a lithium-ion battery welding head structure that can be adapted to the welding mechanism stroke to complete short tab welding tasks, significantly extend the service life of the welding head, and improve the overall welding efficiency.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: This utility model discloses a lithium-ion battery welding head structure, including a body and welding points formed on the working surface of the body. The body is a triangular prism structure with an equilateral triangular cross-section. The welding points are offset and arranged in the same direction with the center line of the working surface of the body as a reference, and the offset amount and offset direction of the welding points on the three working surfaces of the body are the same.

[0007] Preferably, the included angle between two adjacent working surfaces of the body is set to 60°.

[0008] Preferably, the two ends of the body are provided with mounting holes extending along its axial direction, and the body is fixedly connected to an external device by mounting members embedded in the mounting holes.

[0009] Preferably, the mounting hole is a threaded hole, and the mounting component is a screw.

[0010] Preferably, each of the weld points includes a plurality of sub-weld points arranged in an array, with gaps between the end faces of two adjacent sub-weld points.

[0011] Preferably, the sub-welding point is configured as cylindrical, frustum-shaped, or truncated cone-shaped.

[0012] Preferably, the plurality of sub-welding points are arranged in a diagonal pattern.

[0013] Preferably, the number of sub-welding points is set to 80-90, wherein the top surface area of ​​each sub-welding point is set to 0.04-0.16 cm². 2 .

[0014] Preferably, the sub-welding point is an aluminum alloy substrate, and a hard alloy layer is provided on the top surface of the sub-welding point.

[0015] Compared with the prior art, the beneficial technical effects of this utility model are as follows: 1) By adopting a triangular prism structure design, the welding head has three independent working surfaces. When the welding point on one side is worn, the other working surfaces can be rotated and used, which increases the effective service life of the welding head from two times to three times for traditional two-sided welding heads. This significantly reduces the replacement frequency and consumable costs, and improves equipment utilization and production economy. 2) By offsetting the welding points on each working surface in the same direction with the center position as the reference, the welding head can be accurately positioned without exceeding the original stroke range of the welding mechanism when welding shorter tabs, which effectively solves the welding problem of short tabs caused by equipment stroke limitations and improves process adaptability. 3) By arranging the sub-welding points according to the diagonal pattern and controlling the number of sub-welding points to 80-90, and controlling the top surface area of ​​a single point to the optimized range of 0.04-0.16 cm², the uniform distribution of vibration energy and welding pressure on the workpiece surface is ensured, further eliminating the risk of uneven welding patterns and achieving the reliability and consistency of welding strength. 4) By adopting a composite structure that combines an aluminum alloy substrate with a top hard alloy layer, the overall lightweight design and vibration transmission efficiency of the welding head are ensured, while the wear resistance and fatigue strength of the working surface are greatly improved, significantly extending the service life of the welding head in high-frequency and high-pressure working environments. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 This is a three-dimensional schematic diagram of a lithium-ion battery welding head structure according to the present invention; Figure 2 In this utility model Figure 1 The side sectional view mainly shows the overall triangular prism structure outline of the welding head and the offset arrangement of the welding points on the working surface. Figure 3 This utility model Figure 1 The enlarged view at point A shows the arrangement of the sub-welding points.

[0018] Explanation of reference numerals in the attached drawings: 1. Body; 2. Solder joint; 11. Mounting hole; 21. Sub-solder joint. Detailed Implementation

[0019] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0020] like Figure 1-3 As shown, a lithium-ion battery welding head structure includes a body 1 and welding points 2 formed on the working surface of the body 1. The body 1 is a triangular prism structure with an equilateral triangular cross-section. The welding points 2 are offset and arranged in the same direction with the center line of the working surface of the body 1 as a reference, and the offset amount and offset direction of the welding points 2 on the three working surfaces of the body 1 are the same.

[0021] Specifically, the main body 1 is designed as a triangular prism structure, giving it three independent working surfaces. When the weld point 2 on one of the working surfaces wears out due to long-term use, the operator can loosen the mounting parts, rotate one surface of the main body 1 so that the other new working surface faces the workpiece, and then retighten it for continued use. This design increases the number of times a single welding head can be used from the traditional two to three, significantly extending the replacement cycle, improving tool utilization, and reducing production costs. At the same time, the weld points 2 on all working surfaces are uniformly offset in the same direction. This design allows the welding head to be precisely aligned without the welding mechanism itself making overtravel movements when welding short battery tabs, solving the problem of welding short tabs caused by equipment travel limitations.

[0022] Specifically, the included angle between two adjacent working surfaces of the body 1 is set to 60°.

[0023] Specifically, setting the included angle between adjacent working surfaces to 60° ensures that the cross-section of the main body 1 forms a standard equilateral triangle. This symmetrical and stable geometric structure ensures that the center of gravity and stress state of the welding head remain consistent when rotating to change working surfaces, guaranteeing the stability of the welding process and the uniformity of welding quality.

[0024] Specifically, the two ends of the body 1 are provided with mounting holes 11 extending along its axial direction, and the body 1 is fixedly connected to the external device by mounting parts embedded in the mounting holes 11.

[0025] Specifically, the mounting hole 11 is a threaded hole, and the mounting component is a screw.

[0026] Specifically, mounting holes 11 are machined at both ends of the main body 1. Screws or other mounting components pass through these mounting holes 11 to securely mount the welding head onto the ultrasonic welding equipment. The connection method, using threaded holes and screws, is simple and reliable. This not only ensures high stability of the welding head during operation, thus improving welding quality, but also makes disassembly, assembly, and replacement of the welding head more convenient, effectively reducing the time required for equipment maintenance and model changeover.

[0027] Specifically, each of the weld points 2 includes a plurality of sub-weld points 21 arranged in an array, with gaps between the end faces of two adjacent sub-weld points 21.

[0028] Specifically, each weld point 2 is composed of multiple tiny, independent sub-welding points 21 arranged in a matrix, with gaps between the sub-welding points 21. This design makes the actual contact area between the welding head and the workpiece much smaller than the area of ​​a single weld point 2. While ensuring welding strength, this dot matrix contact can avoid problems such as over-welding, workpiece damage, or cracking caused by excessive pressure concentration, significantly improving the welding yield and quality.

[0029] Specifically, the sub-welding point 21 is set in the shape of a cylinder, a frustum, or a truncated cone. The top of these shapes has a small contact area, which is beneficial to generate sufficient pressure during welding. At the same time, its side wall structure can provide good support strength and wear resistance, providing users with flexible choices according to different welding materials and process requirements.

[0030] Specifically, in this embodiment, the sub-welding point 21 is set to a frustum shape.

[0031] Specifically, the multiple sub-welding points 21 are arranged in a diagonal pattern.

[0032] Specifically, this invention arranges multiple sub-welding points 21 in a diagonal or staggered manner, rather than in a simple horizontal or vertical arrangement. This arrangement allows the vibration energy and welding pressure to be distributed more evenly on the workpiece surface, which helps to eliminate welding lines and further prevents the occurrence of incomplete or over-welding phenomena, thereby obtaining a more consistent and stronger welding effect.

[0033] Specifically, the number of sub-welding points 21 is set to 80 to 90, wherein the top surface area of ​​each sub-welding point 21 is set to 0.04 to 0.16 cm². 2 .

[0034] Specifically, the number of sub-welding points 21 is controlled between 80 and 90, and the top surface area of ​​each sub-welding point 21 is designed to be between 0.04 and 0.16 square centimeters. Practical verification has shown that this ratio of number to area allows for the application of just the right pressure during welding. If there are too many sub-welding points 21 or the area is too large, the total pressure will be too high, easily damaging the battery tabs; conversely, if there are too few or the area is too small, the pressure will be insufficient, failing to form a strong molecular layer fusion. This invention achieves an optimal balance between pressure and welding strength within this range, ensuring reliable welding quality.

[0035] Specifically, the sub-welding point 21 is an aluminum alloy substrate, and a hard alloy layer is provided on the top surface of the sub-welding point 21.

[0036] Specifically, the sub-welding point 21 uses aluminum alloy as the base material, ensuring the lightweight nature of the entire welding head structure and good vibration transmission performance. Simultaneously, a hard alloy layer is applied to the top surface of the sub-welding point 21. This hard alloy layer significantly enhances the hardness, wear resistance, and fatigue strength of the weld point contact surface, enabling it to withstand prolonged high-frequency friction and pressure, thereby extending the service life of the welding head. Meanwhile, the aluminum alloy base material ensures its excellent comprehensive mechanical properties.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0038] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A lithium-ion battery welding head structure, characterized in that: It includes a body (1) and weld points (2) formed on the working surface of the body (1). The body (1) is a triangular prism structure with an equilateral triangle cross-section. The weld points (2) are offset and arranged in the same direction with the center line of the working surface of the body (1) as a reference. The offset amount and offset direction of the weld points (2) on the three working surfaces of the body (1) are the same.

2. The lithium-ion battery welding head structure according to claim 1, characterized in that: The included angle between two adjacent working surfaces of the body (1) is set to 60°.

3. The lithium-ion battery welding head structure according to claim 1, characterized in that: The two ends of the body (1) are provided with mounting holes (11) extending along its axial direction. The body (1) is fixedly connected to the external device by mounting parts embedded in the mounting holes (11).

4. The lithium-ion battery welding head structure according to claim 3, characterized in that: The mounting hole (11) is a threaded hole, and the mounting component is a screw.

5. The lithium-ion battery welding head structure according to claim 1, characterized in that: Each of the weld points (2) includes a plurality of sub-weld points (21) arranged in an array, with gaps between the end faces of two adjacent sub-weld points (21).

6. The lithium-ion battery welding head structure according to claim 5, characterized in that: The sub-welding point (21) is set to be cylindrical, frustum-shaped or truncated cone-shaped.

7. A lithium-ion battery welding head structure according to claim 6, characterized in that: The multiple sub-welding points (21) are arranged in a diagonal pattern.

8. The lithium-ion battery welding head structure according to claim 7, characterized in that: The number of sub-welding points (21) is set to 80 to 90, wherein the top surface area of ​​each sub-welding point (21) is set to 0.04 to 0.16 cm². 2 .

9. A lithium-ion battery welding head structure according to claim 8, characterized in that: The sub-welding point (21) is an aluminum alloy substrate, and a hard alloy layer is provided on the top surface of the sub-welding point (21).

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