阅读说明：本技术 一种超声焊焊齿结构、超声焊焊头及超声焊接设备 (Ultrasonic welding tooth structure, ultrasonic welding head and ultrasonic welding equipment ) 是由 胡志海 库志新 王成云 于 2021-09-10 设计创作，主要内容包括：本发明提供一种超声焊焊齿结构,包括焊台及成型在焊台上的若干个焊齿；焊齿呈正四棱台形状,焊齿的顶面正方形边长为0.1-0.5mm。焊台上至少有一排焊齿,焊齿在同一排上间距相等,间距不大于2mm。焊齿在同一列上间距相等,间距不大于2mm。焊齿的高度为待焊物厚度的60％-80％。焊齿的锥形角度为90°。本发明还提供一种超声焊焊头,包括焊接部和连接部；焊接部至少一端设置连接部,焊接部至少一侧设置有上述的焊齿结构。采用该超声焊焊头焊接可以增强极耳和箔材之间的连接强度、提升焊接区域过流能力。实现牢固且稳定的焊接效果,进而提升了锂离子电池安全性和可靠性。(The invention provides an ultrasonic welding tooth structure, which comprises a welding table and a plurality of welding teeth formed on the welding table; the welding teeth are in the shape of a regular quadrangular frustum pyramid, and the side length of a square on the top surface of the welding teeth is 0.1-0.5 mm. The welding table is provided with at least one row of welding teeth, the intervals of the welding teeth on the same row are equal, and the intervals are not more than 2 mm. The welding teeth are arranged on the same row at equal intervals, and the intervals are not more than 2 mm. The height of the welding teeth is 60-80% of the thickness of the object to be welded. The taper angle of the welding teeth is 90 deg.. The invention also provides an ultrasonic welding head which comprises a welding part and a connecting part; at least one end of the welding part is provided with a connecting part, and at least one side of the welding part is provided with the welding tooth structure. The ultrasonic welding head can enhance the connection strength between the tab and the foil and improve the overcurrent capacity of a welding area. Firm and stable welding effect is realized, and then the safety and the reliability of the lithium ion battery are improved.)

1. An ultrasonic weld tooth structure, comprising: the welding device comprises a welding table and a plurality of welding teeth formed on the welding table;

the welding teeth are in the shape of a regular quadrangular frustum pyramid, and the side length of a square on the top surface of the regular quadrangular frustum pyramid is 0.1-0.5 mm.

2. A tooth construction according to claim 1 wherein said welding station has at least one row of said welding teeth.

3. A tooth construction according to claim 2 wherein the teeth are equally spaced in the same row, the spacing being no greater than 2 mm.

4. A tooth construction according to claim 2 wherein the teeth are equally spaced on a row, the spacing being no greater than 2 mm.

5. The ultrasonic welding tooth structure of claim 1, wherein the height of the welding tooth is 60-80% of the thickness of the object to be welded.

6. An ultrasonically welded tooth construction according to claim 1 wherein the taper angle of the tooth is 90 °.

7. An ultrasonic welding horn, comprising: a welding part and a connecting part;

at least one end of the welding part is provided with a connecting part, and at least one side of the welding part is provided with the ultrasonic welding tooth structure as claimed in any one of claims 1 to 6.

8. The ultrasonic welding horn of claim 7 wherein the ultrasonic welding horn is one of a titanium alloy or an aluminum magnesium alloy.

9. The ultrasonic welding head according to claim 7 wherein the connecting portion is provided with a blind bore on the outside thereof, the blind bore being provided with an internal thread.

10. An ultrasonic welding apparatus comprising an ultrasonic welding horn according to any one of claims 7 to 9.

Technical Field

The invention relates to the field of lithium battery manufacturing, in particular to an ultrasonic welding tooth structure, an ultrasonic welding head and ultrasonic welding equipment.

Background

In the manufacturing process of the lithium ion battery, a plurality of layers of aluminum foils are connected with aluminum tabs, and a plurality of layers of copper foils are connected with copper nickel-plated tabs, so that the flow guide is realized, and a certain connection strength is considered. Particularly in the field of power batteries, the total thickness of the positive and negative workpieces is close to 1mm, so that the workpieces with higher thickness are connected with higher strength, and meanwhile, the requirement of product overcurrent is met, which puts forward higher requirements on overcurrent design. In the lithium ion battery, Cu and Al are used as current carriers, and actually, resistance welding or laser welding techniques are adopted to have great challenges, because Cu and Al have excellent electrical conductivity and thermal conductivity, it is difficult to obtain a welding spot/core with a large size, and in addition, the reflectivity of Cu and Al is also good, high power is required and the equipment cost is high by laser welding.

Compared with resistance welding and laser welding, the ultrasonic welding is more suitable for high-conductivity and high-heat-conductivity materials, and has good adaptability to special-shaped materials and multi-layer materials. Ultrasonic welding is widely applied to the connection of foils and tabs in lithium ion batteries as a solid-phase connection technology, and the welding effect inevitably affects the overcurrent and welding strength of the tabs of the lithium ion batteries, so that the safety and reliability of the lithium ion batteries are affected. In the field of power batteries, the overcurrent capacity of a welding area needs to be focused by adopting ultrasonic welding, and the temperature of a battery core is higher and the risk of thermal runaway of the battery core is increased if the overcurrent capacity of the welding area is insufficient. The improvement of the ultrasonic welding effect of the foil and the electrode lug in the lithium ion battery mainly focuses on the optimization of welding parameters, such as welding time, amplitude, welding pressure and the like, and although the welding parameters influence the welding effect to a certain extent, the welding effect is mainly influenced by a welding head, such as the size of welding teeth and the arrangement mode of the welding teeth.

Disclosure of Invention

The invention aims to provide an ultrasonic welding tooth structure, which is designed aiming at the welding tooth structure of an ultrasonic welding head, and has great application value for improving the overcurrent of a welding area, improving the welding strength and improving the welding effect.

In order to achieve the purpose, the invention adopts the following technical scheme:

an ultrasonic welded tooth structure comprising: the welding device comprises a welding table and a plurality of welding teeth formed on the welding table;

the welding teeth are in the shape of a regular quadrangular frustum pyramid, and the side length of a square on the top surface of the regular quadrangular frustum pyramid is 0.1-0.5 mm.

Furthermore, at least one row of welding teeth is arranged on the welding table.

Further, the welding teeth are arranged on the same row at equal intervals, and the intervals are not more than 2 mm.

Further, the welding teeth are arranged on the same row at equal intervals, and the intervals are not more than 2 mm.

Further, the height of the welding tooth is 60% -80% of the thickness of the object to be welded.

Further, the taper angle of the welding teeth is 90 °.

Another object of the present invention is to provide an ultrasonic welding horn comprising: a welding part and a connecting part;

at least one end of the welding part is provided with a connecting part, and at least one side of the welding part is provided with the ultrasonic welding tooth structure.

Further, the ultrasonic welding head is made of one of titanium alloy or aluminum magnesium alloy.

Furthermore, a blind hole is formed in the outer side of the connecting portion, and an internal thread is formed in the blind hole.

The invention also aims to provide ultrasonic welding equipment which comprises the ultrasonic welding head.

The invention has the following beneficial effects:

the invention discloses an ultrasonic welding tooth structure, which comprises a welding table and a plurality of welding teeth formed on the welding table; the welding teeth are in the shape of a regular quadrangular frustum pyramid, and the side length of a square on the top surface of the welding teeth is 0.1-0.5 mm. And the overcurrent capacity of the welding area of the lithium ion battery foil and the lug is improved. An ultrasonic welding head comprises a welding part and a connecting part; at least one end of the welding part is provided with a connecting part, and at least one side of the welding part is provided with the welding tooth structure. The ultrasonic welding head can enhance the connection strength between the tab and the foil and improve the overcurrent capacity of a welding area. Firm and stable welding effect is realized, and then the safety and the reliability of the lithium ion battery are improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view of a tooth structure welded by ultrasonic welding;

FIG. 2 is a schematic view of a tooth angle for an ultrasonic welded tooth structure;

FIG. 3 is a schematic view of an ultrasonic welding horn;

FIG. 4 is an enlarged, fragmentary schematic view of the construction of an ultrasonic welding horn;

FIG. 5 is a schematic view of an alternative ultrasonic welding horn configuration;

FIG. 6 is a prior art weld effect diagram;

fig. 7 is a diagram of the welding effect by adopting the technical scheme of the invention.

Shown in the figure: 1-welding part, 11-welding table, 12-welding tooth and 2-connecting part.

Detailed Description

The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

The welding head is a key component of ultrasonic metal welding, and in the welding process, the welding head needs to tightly hold a workpiece to be welded under the action of pressure, so that the mechanical vibration energy generated by ultrasonic welding equipment can be transferred to the interface of the workpiece to be welded to form solid-phase connection. The welding heads have different contact areas, so that the distribution of welding pressure in the welding process is different, namely, the connection interfaces have different stresses, so that the friction force in the welding process is different, the friction heat generation amount in the welding process is different, the temperature of a workpiece in the welding process is different, and the joint quality is finally influenced. The depth of the welding head pattern tooth determines the difficulty of embedding the welding head pattern into the surface of a workpiece, the depth of the indentation on the surface of the lug is directly influenced, the temperature of the workpiece in the welding process is indirectly influenced, and the quality of the joint is influenced. Therefore, the appearance and the size of the welding teeth play a very critical role in the quality of the joint.

Referring to fig. 1 and 2, an ultrasonic welding tooth structure comprises a welding table and a plurality of welding teeth formed on the welding table, wherein the welding teeth 12 are in a regular quadrangular frustum pyramid shape, and the bottom surfaces of the welding teeth 12 and the top surfaces of the welding teeth 12 are square. The length y of the square edge on the top surface of the welding tooth is 0.1-0.5 mm. Experiments show that when the welding tooth areas are the same, the plastic deformation degree of the rectangular welding tooth is stronger than that of the circular welding tooth, wherein the welding effect is the best when the side length of the rectangle, namely the side length range of the square on the top surface of the welding tooth, is 0.1-0.5 mm. The smaller area of the tooth causes the surface contact area of the workpiece to be pressurized more, thereby forming a deeper impression.

According to the characteristics of the regular quadrangular frustum pyramid, the bottom surface side length can be obtained according to the top surface side length and the height of the regular quadrangular frustum pyramid. In the embodiment, the side length of the top surface of the welding tooth is 0.1-0.5mm, and the height of the welding tooth is 60-80% of the thickness of the object to be welded. The height h of the welding tooth 12 is determined to be 0.2-0.9mm according to the thickness of the foil, and the side length x of the square at the bottom of the obtained welding tooth ranges from 0.5mm to 2.3 mm.

In this embodiment, there are two rows of several rows of welding teeth on the welding table, the gap between the rows is 0.6mm, and there is no gap between the rows. Can weld the interval and the row number of 12 tooth numbers of tooth according to the product demand setting, wherein, weld the bench and have at least one row weld the tooth, weld the tooth and equal at same one row of interval, the interval is not more than 2mm, welds the tooth and equal at same row interval, and the interval is not more than 2 mm. Is favorable for realizing firm and stable welding effect. In the present embodiment, the taper angle α of the tooth 12 is 90 °. As shown in fig. 6-7, the original welding tooth structure is compared with the welding tooth structure designed by the technical scheme, and the welding tooth structure designed by the technical scheme has obviously better welding effect.

Referring to fig. 3 and 4, an ultrasonic welding horn is shown, the horn being a half-wavelength horn. Including welding part 1 and connecting portion 2, 2 one ends of connecting portion set up welding part 1, and the 2 other ends of connecting portion are equipped with the blind hole, and the blind hole is equipped with the internal thread for the bonding tool is connected with ultrasonic welding equipment. The welding part 1 is provided with a welding table 11 up and down, and the edge of the welding table 11 is provided with a plurality of welding teeth 12. When the welding teeth 12 on the welding table 11 at one end are damaged, the welding head can be rotated, and the welding table 11 at the other end is used, so that the service life of the welding head is prolonged, and the cost of the welding head is saved.

Referring to fig. 5, an ultrasonic welding horn is shown, the horn being a full wavelength horn. Including welding portion 1 and connecting portion 2, connecting portion 2 sets up 1 both ends in the welding portion. The outer side of the connecting part 2 is provided with a blind hole, and the blind hole is provided with internal threads for connecting the welding head with ultrasonic welding equipment. The welding part 1 is flat to fit for welding in a small space. The welding part 1 is provided with a welding table 11 up and down, and the edge of the welding table 11 is provided with a plurality of welding teeth 12. When the welding teeth 12 on the welding table 11 at one end are damaged, the welding head can be rotated, and the welding table 11 at the other end is used, so that the service life of the welding head is prolonged, and the cost of the welding head is saved. The length of the full wavelength is 2 times of the length of the half wavelength, and the maximum energy is generated when the wave crest and the wave trough are generated by utilizing the characteristic that the ultrasonic wave is transmitted in the medium, so that the limitation of the use of the half-wavelength ultrasonic welding head is well made up.

Compared with the existing ultrasonic welding head, the welding teeth 12 of the half-wave ultrasonic welding head or the full-wave ultrasonic welding head of the invention are in the shape of a regular quadrangular frustum pyramid, the side length of the square on the top surface of the quadrangular frustum pyramid is 0.1-0.5mm, and the welding teeth are used for welding lithium ion battery foils and tabs. The welding head can be used for welding to enhance the connection strength between the tab and the foil and improve the overcurrent capacity of a welding area. Firm and stable welding effect is realized, and then the safety and the reliability of the lithium ion battery are improved.

An ultrasonic welding device comprises a half-wave ultrasonic welding head or a full-wave ultrasonic welding head of an ultrasonic welding tooth structure. The ultrasonic welding equipment utilizes high-frequency vibration waves to transfer energy to the surface of a tab to be welded, and under the condition of pressurization, the foil and the surface of the tab are mutually rubbed to generate heat so as to achieve fusion at the atomic level and achieve the effect of firm welding.

In the description of the present invention, it is to be understood that the terms "intermediate", "length", "upper", "lower", "front", "rear", "vertical", "horizontal", "inner", "outer", "radial", "circumferential", and the like, indicate orientations and positional relationships that are based on the orientations and positional relationships shown in the drawings, are used for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the first feature may be "on" the second feature in direct contact with the second feature, or the first and second features may be in indirect contact via an intermediate. "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The above description is for the purpose of illustrating embodiments of the invention and is not intended to limit the invention, and it will be apparent to those skilled in the art that any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the invention shall fall within the protection scope of the invention.