CN220312069U

CN220312069U - Ultrasonic welding head for metal foil of soft-package lithium battery

Info

Publication number: CN220312069U
Application number: CN202322123686.0U
Authority: CN
Inventors: 刘承俊; 曹连厚; 丁东成; 陈森泉; 谭科
Original assignee: Guangdong Rixin High Precision Technology Co ltd
Current assignee: Guangdong Rixin High Precision Technology Co ltd
Priority date: 2023-08-09
Filing date: 2023-08-09
Publication date: 2024-01-09
Anticipated expiration: 2033-08-09

Abstract

The application provides a soft packet of lithium cell metal foil ultrasonic bonding tool, including main part, at least one row of first tooth portion and at least one row of second tooth portion that welds, first tooth portion and second tooth portion all set up the same side at main part, and second tooth portion is located one side that first tooth portion is close to soft packet of lithium cell, and first tooth portion includes the first tooth that a plurality of ranges set up, and second tooth portion includes the second tooth that a plurality of ranges set up, and the tooth height of first tooth is higher than the tooth height of second tooth that welds. In sum, the welding quality and the firmness can be improved when the battery foil is welded, and the influence of the ultrasonic residual energy on the battery surface foil and the main body part of the soft-package lithium battery is effectively prevented, so that the performance and the reliability of the battery are ensured.

Description

Ultrasonic welding head for metal foil of soft-package lithium battery

Technical Field

The application relates to the field of ultrasonic welding heads, in particular to a soft package lithium battery metal foil ultrasonic welding head.

Background

In lithium battery production, metal foils are often used to make electrodes for batteries, where the Tab (Tab) is part of the battery pole piece (electrode). The tab is a protruding portion of one side or both sides of the metal foil for connection with an external circuit of the battery. During production, the tabs need to be connected to other components of the cell, such as current collectors or electrode collectors.

In the prior art, the welding teeth with the same height are generally used for welding multiple layers of foils, the welding teeth can be used when the welding teeth are used for layers below 80, if the welding teeth are used for more than 80 layers, ultrasonic energy can not be uniformly transmitted to foils of all layers, so that welding is uneven, and particularly the foils on the surface layer can not be sufficiently welded, and the foils on the surface layer part can not be firmly welded.

The rest energy of the ultrasonic waves also can impact the surface of the foil and the main body part of the soft package lithium battery, the impact of the ultrasonic energy causes stress concentration on the surface of the foil, and if the bearing capacity of the foil is exceeded, the foil can be subjected to plastic deformation or loose structure, so that the welding strength is reduced; when the ultrasonic residual energy impacts the soft-package lithium battery main body, the impact can cause damage or peeling of the coating of the soft-package lithium battery main body, and the performance and the stability of the battery are affected.

Disclosure of Invention

The purpose of the application is to provide a novel soft package lithium battery metal foil ultrasonic welding head; when the welding head is pressed down, uniform ultrasonic energy can be provided, so that the surface foil can be fully welded, the ultrasonic residual energy can be prevented from being directly transmitted to the surface of the surface foil and the soft package lithium battery main body, the foil is broken or the foil coating is damaged, and the welding quality is affected.

In order to achieve the above object, the present application provides the following technical solutions:

the utility model provides a soft packet of lithium cell metal foil ultrasonic bonding tool, includes main part, at least one row of first tooth portion and at least one row of second tooth portion that welds, first tooth portion and second tooth portion all set up the same side at main part, second tooth portion is located one side that first tooth portion is close to soft packet of lithium cell, first tooth portion includes the first tooth that a plurality of ranges set up, second tooth portion includes the second tooth that a plurality of ranges set up, the tooth height of first tooth than the tooth height of second tooth.

Further, the first welding teeth are inverted rectangular pyramids.

Further, the second welding teeth are semi-spherical.

Further, the second tooth portion further includes a plurality of third teeth, and the tooth height of the third teeth is the same as the tooth height of the first teeth.

Further, the third welding teeth are inverted rectangular pyramids.

Further, the third welding teeth and the second welding teeth are arranged in a clearance between each other.

Further, the third welding teeth and the second welding teeth are alternately arranged.

Further, two third welding teeth arranged side by side are arranged between the two second welding teeth.

Further, the tooth height of the first welding tooth is 1.5 mm-3.5 mm.

Further, the tooth height of the first welding tooth is 2.7mm.

The beneficial effects of this application are:

because the tooth height of the first welding tooth is higher than that of the second welding tooth, when the foil is welded, each layer of foil is welded through the first welding tooth, and the second welding tooth starts to weld the foil along with the continuous descending of the welding head, so that the welding head can apply secondary pressure and vibration to the foil on the surface layer part, the surface layer foil can be fully welded, and the welding uniformity and quality are improved; and the second welding teeth also have the effect of releasing the residual ultrasonic waves of the welding head, so that the vibration and the pressure of the welding head can be more uniformly transmitted to a welding area during welding, and the possibility that the residual ultrasonic energy directly impacts the surface of the surface layer foil of the battery is reduced. This helps to prevent cracking of the surface layer foil or damage of the coating, guaranteeing stability and safety of the battery. And finally, the second welding tooth part is positioned at one side of the first welding tooth part, which is close to the soft package lithium battery, and can transmit ultrasonic residual energy to the main body part of the soft package lithium battery. In summary, the welding quality and the firmness can be improved when the battery foil is welded, and the influence of the ultrasonic residual energy on the battery surface foil and the main body part of the soft-package lithium battery is effectively prevented, so that the performance and the reliability of the battery are ensured.

Drawings

Fig. 1 is a schematic structural diagram of an ultrasonic welding head for a metal foil of a soft-package lithium battery according to an embodiment of the present application;

FIG. 2 is a bottom view of a flexible lithium battery metal foil ultrasonic welding head according to one embodiment of the present disclosure;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

fig. 4 is a front view of an ultrasonic welding head for a metal foil of a flexible lithium battery according to an embodiment of the present application;

FIG. 5 is a partial enlarged view of FIG. 4 at B;

fig. 6 is a bottom view of a flexible lithium battery metal foil ultrasonic welding head according to another embodiment of the present application;

fig. 7 is a partial enlarged view of fig. 6 at C.

Reference numerals illustrate:

1. a main body portion; 2. a first welding tooth part; 3. a second tooth portion;

21. a first welding tooth; 31. a second welding tooth; 32. a third welding tooth;

Detailed Description

The terminology used in the description of the embodiments of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application, as will be described in detail with reference to the accompanying drawings.

As shown in fig. 1 to 5, an ultrasonic welding head for a metal foil of a soft package lithium battery comprises a main body part 1, two rows of first welding teeth 2 and one row of second welding teeth 3, wherein the first welding teeth 2 and the second welding teeth 3 are arranged on the same side surface of the main body part 1, the second welding teeth 3 are positioned on one side of the first welding teeth 2 close to the soft package lithium battery, the first welding teeth 2 comprise a plurality of first welding teeth 21 which are arranged in a row, the second welding teeth 3 comprise a plurality of second welding teeth 31 which are arranged in a row, and the tooth height H1 of the first welding teeth 21 is higher than the tooth height H2 of the second welding teeth 31.

Because the tooth height of the first welding tooth 21 is higher than that of the second welding tooth 31, when the foil is welded, each layer of foil is welded through the first welding tooth 21, and the second welding tooth 31 starts to weld the foil along with the continuous descending of the welding head, so that the welding head can apply secondary pressure and vibration to the foil at the surface layer part, the surface layer foil can be fully welded, and the welding uniformity and quality are improved; and the second welding teeth 31 also have the function of releasing the residual ultrasonic waves of the welding head, so that the vibration and the pressure of the welding head during welding can be more uniformly transmitted to a welding area, and the possibility that the residual ultrasonic energy directly impacts the surface of the surface layer foil of the battery is reduced. This helps to prevent cracking of the surface layer foil or damage of the coating, guaranteeing stability and safety of the battery. And finally, the second welding tooth part 3 is positioned at one side of the first welding tooth part 2 close to the soft package lithium battery, and the second welding tooth part 3 can transmit ultrasonic residual energy to the main body part 1 of the soft package lithium battery. In sum, the welding quality and the firmness can be improved when the battery foil is welded, and the influence of the ultrasonic residual energy on the battery surface foil and the main body part 1 of the soft-package lithium battery is effectively prevented, so that the performance and the reliability of the battery are ensured.

As shown in fig. 3, in the present embodiment, the first welding teeth 21 are inverted rectangular pyramids. The welding teeth in the shape of the inverted rectangular pyramid have larger welding area, and can cover more welding areas during welding, so that a plurality of welding spots can be welded at one time. Such a design may improve the welding efficiency, especially when welding multi-layer foils, enabling faster completion of the welding operation.

The welding teeth in the shape of the inverted rectangular pyramid can uniformly distribute welding pressure when being pressed down, so that the welding head can apply uniform force to a welding area, and the welding is more uniform and stable.

In the present embodiment, as shown in fig. 3, the second welding teeth 31 are semi-spherical. The welding pressure is concentrated at the tip of the welding tooth due to the small contact area of the welding tooth in the shape of a semicircle. The design can improve the welding pressure concentration of the welding head, so that the welding head applies more concentrated pressure in a welding area, thereby being beneficial to better pressing and welding foil materials and improving the welding quality.

As shown in fig. 6 and 7, in the present embodiment, the second tooth portion 3 further includes a plurality of third teeth 32, and the tooth height of the third teeth 32 is the same as the tooth height of the first teeth 21. The presence of the third welding teeth 32 may increase the contact area between the welding head and the battery tab. More welding points can provide more contact surfaces, so that the foil is pressed and welded better during welding, and the welding quality and firmness are improved.

In this embodiment, the third welding teeth 32 are inverted rectangular pyramids.

In the present embodiment, the third bonding wire 32 is spaced from the second bonding wire 31. By providing a space between the third tooth 32 and the second tooth 31, it is possible to avoid that the welding spot is too concentrated in the welding area. If the welding spots are too dense, the pressure applied by the welding head may be uneven enough to affect the welding quality. The welding points can be uniformly distributed to a certain extent by the interval arrangement, so that the pressure of the welding head on the welding area is ensured to be uniformly applied, and the welding quality and the firmness are improved.

In the present embodiment, the third bonding wires 32 and the second bonding wires 31 are alternately arranged.

In this embodiment, two third welding teeth 32 are disposed between two second welding teeth 31. By disposing two third bonding wires 32 side by side between two second bonding wires 31, the density of bonding points can be increased. More welding points means that more welding points can be welded at one time under the same welding head size, thereby improving welding efficiency.

In this embodiment, the tooth height of the first welding tooth 21 is 1.5mm to 3.5mm.

In this embodiment, the tooth height of the first welding tooth 21 is 2.7mm.

In the description of the embodiments of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, indirectly connected through an intermediary, or may be in communication with each other between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to the specific circumstances.

The embodiments or implications herein must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the embodiments herein. In the description of the embodiments of the present application, the meaning of "a plurality" is two or more, unless specifically stated otherwise.

The terms first, second, third, fourth and the like in the description and in the claims of embodiments of the application and in the above-described figures, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented, for example, in sequences other than those illustrated or described herein. Furthermore, the terms "may include" and "have," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed or inherent to such process, method, article, or apparatus.

Finally, it should be noted that: the foregoing embodiments are merely illustrative of the technical solutions of the embodiments of the present application, and are not limiting thereof. Although embodiments of the present application have been described in detail with reference to the foregoing embodiments, it will be appreciated by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments may be modified or some or all of the technical features may be replaced with equivalents. Such modifications and substitutions do not depart from the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. The utility model provides a soft packet of lithium cell metal foil ultrasonic bonding tool which characterized in that: including main part, at least one row of first tooth portion that welds and at least one row of second tooth portion, first tooth portion that welds and second tooth portion all set up in the same side of main part, the second tooth portion that welds is located one side that first tooth portion is close to soft packet lithium cell, first tooth portion that welds includes a plurality of first teeth that arrange the setting, second tooth portion that welds including a plurality of second teeth that arrange the setting, the tooth height of first tooth that welds is higher than the tooth height of second tooth.

2. The ultrasonic welding head for a metal foil of a soft-packaged lithium battery according to claim 1, wherein the ultrasonic welding head comprises the following components: the first welding teeth are inverted rectangular pyramids.

3. The ultrasonic welding head for a metal foil of a soft-packaged lithium battery according to claim 1, wherein the ultrasonic welding head comprises the following components: the second welding teeth are semi-spheres.

4. A flexible lithium battery metal foil ultrasonic welding head according to any one of claims 1 to 3, characterized in that: the second tooth portion further includes a plurality of third teeth, the third teeth having a tooth height that is the same as the tooth height of the first teeth.

5. The ultrasonic welding head for the metal foil of the soft-package lithium battery according to claim 4, wherein the ultrasonic welding head comprises the following components: the third welding teeth are inverted rectangular pyramids.

6. The ultrasonic welding head for the metal foil of the soft-package lithium battery according to claim 4, wherein the ultrasonic welding head comprises the following components: the third welding teeth and the second welding teeth are arranged at intervals.

7. The ultrasonic welding head for the metal foil of the soft-package lithium battery according to claim 4, wherein the ultrasonic welding head comprises the following components: the third welding teeth and the second welding teeth are alternately arranged.

8. The ultrasonic welding head for the metal foil of the soft-package lithium battery according to claim 4, wherein the ultrasonic welding head comprises the following components: two third welding teeth which are arranged side by side are arranged between the two second welding teeth.

9. The ultrasonic welding head for a metal foil of a soft-packaged lithium battery according to claim 1, wherein the ultrasonic welding head comprises the following components: the tooth height of the first welding tooth is 1.5 mm-3.5 mm.

10. The ultrasonic welding head for metal foil of a soft package lithium battery according to claim 9, wherein: the tooth height of the first welding tooth is 2.7mm.