KR-20260065135-A - Ultrasonic welding device and secondary battery manufactured therefrom

Abstract

An ultrasonic welding device according to an embodiment of the present invention comprises an anvil that supports a welding target from below; and a welding horn disposed above the welding target and having a body, at least one pair of heads provided at one end of the body, and a plurality of welding boards provided on one surface of the heads, wherein the position of the heads in the first welding of the welding target and the position of the heads in the second welding are different from each other. According to an embodiment of the present invention, since the welding area between the substrate tabs and the welding area between the substrate tabs and the lead tabs do not overlap, damage such as fracture or perforation of the welded parts can be prevented. Accordingly, the adhesion between substrate tabs and the cutting uniformity of the substrate tabs can be improved. In addition, the welding quality can be improved by welding strip terminals to the uniform surface of the substrate tabs.

Inventors

• 서예진
• 김동현
• 문은정

Assignees

• 삼성에스디아이 주식회사

Dates

Publication Date

20260508

Application Date

20241101

Claims (20)

1. An anvil supporting the welding target from below; and A welding horn disposed on the upper part of the welding target and comprising a body, at least one pair of heads provided at one end of the body, and a plurality of welding boards provided on one surface of the head, An ultrasonic welding device characterized by the fact that the position of the head in the first welding of a workpiece and the position of the head in the second welding are different from each other.
2. In Article 1, An ultrasonic welding device characterized in that the head is provided to be detachably or movably connected to the body.
3. In Article 2, An ultrasonic welding device characterized in that, during the first welding, the heads move away from each other, and during the second welding, the heads come into close contact with each other.
4. In Paragraph 3, An ultrasonic welding device having a coupling part in the head and an insertion part in the body.
5. In Article 1, An ultrasonic welding device characterized in that the welding horns are provided in pairs, and the heads are provided one per welding horn.
6. In Article 5, An ultrasonic welding device characterized by the welding horn being moved in a direction where the heads move away from each other during the first welding, and the welding horn being moved so that the heads come into close contact with each other during the second welding.
7. In Article 3 or Article 6, An ultrasonic welding device characterized in that the primary weld portion resulting from the primary welding and the secondary weld portion resulting from the secondary welding do not overlap each other.
8. In Article 6, An ultrasonic welding device characterized by having a secondary weld portion provided between the primary weld portions.
9. In Article 8, An ultrasonic welding device having an even number of the above-mentioned first welds and the above-mentioned second welds.
10. An electrode assembly having a cathode plate having a plurality of cathode substrate tabs, an anode plate having a plurality of anode substrate tabs, and a separator interposed between the cathode plate and the anode plate; It includes a pair of strip terminals electrically connected to the above-mentioned cathode substrate tab and the above-mentioned anode substrate tab, respectively, and A secondary battery manufactured by an ultrasonic welding device, wherein the above-mentioned negative electrode substrate tab, the above-mentioned positive electrode substrate tab, and the above-mentioned strip terminal are welded together by an ultrasonic welding device according to claim 3 or claim 6.
11. In Article 10, A secondary battery manufactured by an ultrasonic welding device, wherein the primary welding is welding between a plurality of the above-mentioned negative electrode tabs and between a plurality of the above-mentioned positive electrode tabs.
12. In Article 11, A secondary battery manufactured by an ultrasonic welding device, wherein the secondary welding is a welding between the negative electrode substrate tab and the strip terminal and between the positive electrode substrate tab and the strip terminal that was welded in the first welding.
13. In Article 12, A secondary battery manufactured by an ultrasonic welding device, characterized in that the primary weld portion resulting from the primary welding above is provided on the negative electrode substrate tab and the positive electrode substrate tab, respectively.
14. In Article 13, A secondary battery manufactured by an ultrasonic welding device, characterized in that the secondary weld portion resulting from the secondary welding is respectively provided on the strip terminal welded to the negative electrode substrate tab and the strip terminal welded to the positive electrode substrate tab.
15. In Article 14, A secondary battery manufactured by an ultrasonic welding device, characterized in that the width in the X-axis direction of the above negative electrode substrate tab and the above positive electrode substrate tab is larger than that of the strip terminal.
16. In Article 15, A secondary battery manufactured by an ultrasonic welding device, characterized in that the first weld and the second weld do not overlap each other.
17. In Article 16, A secondary battery manufactured by an ultrasonic welding device, characterized in that the secondary weld is provided between the primary welds.
18. In Article 17, A secondary battery manufactured by an ultrasonic welding device, characterized in that the above primary weld is positioned at both ends in the X-axis direction of the above negative electrode substrate tab and the above positive electrode substrate tab.
19. In Article 17, A secondary battery manufactured by an ultrasonic welding device, characterized in that the above primary welds are spaced apart from each other in the Y-axis direction of the above negative electrode substrate tab and the above positive electrode substrate tab.
20. In Article 19, A secondary battery manufactured by an ultrasonic welding device, wherein the first weld and the second weld are provided in an even number.

Description

Ultrasonic welding device and secondary battery manufactured therefrom An embodiment of the present invention relates to an ultrasonic welding device and a secondary battery manufactured thereby. Unlike primary batteries, which cannot be recharged, secondary batteries are batteries capable of both charging and discharging. Low-capacity secondary batteries are used in small portable electronic devices such as smartphones, feature phones, laptop computers, digital cameras, and camcorders, while high-capacity secondary batteries are widely used as power sources for motor drive systems and power storage batteries in hybrid and electric vehicles. Such secondary batteries include an electrode assembly consisting of a positive electrode and a negative electrode, a case housing the assembly, and electrode terminals connected to the electrode assembly. An ultrasonic welding device can be used for welding between multiple substrate tabs of a secondary battery, or for welding between a substrate tab and a strip terminal. An ultrasonic welding device is a device that places a workpiece on an anvil, pressurizes the workpiece with a welding horn having a protruding welding plate, and applies heat and pressure to the workpiece via ultrasound to perform welding. Generally, since strip terminals are welded after multiple substrate tabs have been welded, damage may occur in the overlapping weld areas. The information described above disclosed in the background technology of this invention is intended only to enhance understanding of the background of the present invention and may therefore include information that does not constitute prior art. The following drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description of the invention provided below; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings. Figure 1 is a schematic diagram of an exemplary ultrasonic welding device. FIG. 2 is a plan view of a welding horn according to one embodiment of the present invention. FIG. 3 is a front view briefly illustrating the state of a welding horn at a first welding position according to one embodiment of the present invention. FIG. 4 is a front view briefly illustrating the state of the welding horn at the second welding position according to FIG. 3. FIG. 5 is a front view briefly illustrating the state of the welding horn at the first welding position according to another embodiment of the present invention. FIG. 6 is a front view briefly illustrating the state of the welding horn at the second welding position according to FIG. 5. FIG. 7 is a schematic diagram briefly illustrating a weld at the first welding position of a welding horn according to embodiments of the present invention. FIG. 8 is a plan view illustrating the first welded portion according to FIG. 7. Figure 9 is a schematic diagram illustrating the process of a welding horn moving from a first welding position to a second welding position. FIG. 10 is a front view briefly illustrating a weld at a second welding position of a welding horn according to embodiments of the present invention. FIG. 11 is a plan view illustrating the second welded portion according to FIG. 10. FIG. 12 is a plan view illustrating a first welded portion according to another embodiment of the present invention. FIG. 13 is a plan view illustrating the second welded portion according to FIG. 12. FIG. 14 is a plan view illustrating a first welded portion according to another embodiment of the present invention. FIG. 15 is a plan view illustrating the second welded portion according to FIG. 14. FIG. 16 is a perspective view illustrating a secondary battery manufactured by an ultrasonic welding device according to embodiments of the present invention. Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings. Instead, based on the principle that the inventor can appropriately define the concepts of terms to best describe their invention, they should be interpreted in a meaning and concept consistent with the technical spirit of the present invention. Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are merely some of the most preferred embodiments of the present invention and do not represent all of the technical spirit of the present invention. It should be understood that various equivalents and modifications capable of replacing them may exist at the time of filing this application. Additionally, as used herein, “comprise, include” and/or “comprising, including” specify the presence of th