CN-121988857-A - Ultrasonic welding apparatus and method of manufacturing secondary battery using the same

Abstract

An ultrasonic welding apparatus and a method for manufacturing a secondary battery using the same are disclosed. An ultrasonic welding apparatus according to an embodiment of the present disclosure includes an anvil supporting a welding target from below, and a welding head configured to be disposed above the welding target and having a main body, a head provided on one end of the main body, and a plurality of welding knurls provided on one side surface of the head, wherein a position of the head in primary welding of the welding target and a position of the head in secondary welding are different from each other. According to the embodiments of the present disclosure, since the welding region between the substrate tabs and the lead tabs do not overlap, damage such as breakage or perforation of the welding portion can be prevented. Accordingly, adhesiveness between the substrate tabs and cutting uniformity of the substrate tabs can be improved. In addition, the bar-shaped terminals can be soldered on the uniform surface of the substrate tab, thereby improving soldering quality.

Inventors

• XU RUIZHEN
• JIN DONGXUAN
• Wen Enzhen

Assignees

• 三星SDI株式会社

Dates

Publication Date

20260508

Application Date

20250722

Priority Date

20241101

Claims (20)

1. 1. An ultrasonic welding apparatus for a secondary battery, comprising: an anvil configured to support a welding target, and A welding head configured to be disposed over the welding target, the welding head comprising: A main body; a head part provided on one end of the main body, and A plurality of weld knurls disposed on a surface of each of the heads, Wherein, at the time of the initial welding of the welding target, each of the heads is in a first position, Wherein each of the heads is in a second position at the time of secondary welding of the welding target, and Wherein the first position and the second position are different from each other.
2. 2. The ultrasonic welding device according to claim 1, wherein each of the heads is detachable or movable from the body.
3. 3. The ultrasonic welding device according to claim 2, wherein the heads are provided as a pair, and a distance between a pair of heads in the first position is greater than a distance between the pair of heads in the second position.
4. 4. The ultrasonic welding device of claim 3, wherein each of the pair of heads comprises a coupling portion, and wherein the body comprises an insert portion corresponding to the coupling portion.
5. 5. The ultrasonic welding apparatus of claim 1 wherein the weld heads are provided in pairs and each weld head has a head.
6. 6. The ultrasonic welding device of claim 5, wherein a distance between the welding heads in the first position is greater than a distance between the welding heads in the second position.
7. 7. The ultrasonic welding apparatus according to any one of claims 1 to 6, wherein a primary welding portion subjected to the primary welding and a secondary welding portion subjected to the secondary welding do not overlap each other.
8. 8. The ultrasonic welding apparatus according to claim 7, wherein the secondary welding portion is provided between two of the primary welding portions.
9. 9. The ultrasonic welding apparatus according to claim 8, wherein the primary welding portion and the secondary welding portion are each provided in an even number.
10. 10. A method for manufacturing a secondary battery using the ultrasonic welding apparatus of claim 1, the method comprising: the method includes welding a negative electrode substrate tab of a negative electrode plate of an electrode assembly of the secondary battery to a first strip-shaped terminal using the ultrasonic welding device to electrically connect the first strip-shaped terminal to the negative electrode substrate tab, and welding a positive electrode substrate tab of a positive electrode plate of the electrode assembly to a second strip-shaped terminal to electrically connect the second strip-shaped terminal to the positive electrode substrate tab.
11. 11. The method of claim 10, wherein the welding comprises an initial weld between a plurality of the negative electrode substrate tabs and a plurality of the positive electrode substrate tabs.
12. 12. The method of claim 11, wherein the welding further comprises a secondary weld between the first welded plurality of negative electrode substrate tabs and the first strip terminal and a secondary weld between the first welded plurality of positive electrode substrate tabs and the second strip terminal.
13. 13. The method of claim 12, wherein the primary welding is performed on the negative electrode substrate tab and the positive electrode substrate tab.
14. 14. The method according to claim 13, wherein the secondary welding is performed on the first strip-shaped terminal to be welded to the negative electrode substrate tab and on the second strip-shaped terminal to be welded to the positive electrode substrate tab.
15. 15. The method of claim 14, wherein a width of the negative electrode substrate tab in a first direction and a width of the positive electrode substrate tab in the first direction are greater than a width of the first and second strip terminals, respectively, in the first direction.
16. 16. The method according to claim 15, wherein a primary welded portion subjected to the primary welding and a secondary welded portion subjected to the secondary welding do not overlap each other.
17. 17. The method of claim 16, wherein the secondary weld is disposed between two of the primary welds.
18. 18. The method according to claim 17, wherein the primary welding portions are arranged at both ends of the negative electrode substrate tab and the positive electrode substrate tab in the first direction.
19. 19. The method of claim 17, wherein two of the primary welded portions are spaced apart from each other on the negative electrode substrate tab and the positive electrode substrate tab in a second direction perpendicular to the first direction.
20. 20. The method of claim 19, wherein the primary welded portion and the secondary welded portion are each provided as an even number.

Description

Ultrasonic welding apparatus and method of manufacturing secondary battery using the same Cross Reference to Related Applications The present application claims priority and benefit from korean patent application No. 10-2024-0153141 filed on 1 month 11 2024 to the korean intellectual property office, the entire disclosure of which is incorporated herein by reference. Technical Field The present disclosure relates to an ultrasonic welding apparatus and a method for manufacturing a secondary battery using the ultrasonic welding apparatus. Background Unlike the primary battery, the secondary battery can be charged and discharged. A low-capacity secondary battery having a single battery cell packaged in the form of a pack is widely used for small-sized portable electronic devices such as smart phones, function phones, laptop computers, digital cameras, video cameras, and the like, and a large-capacity secondary battery is widely used as a power source for driving a motor in a hybrid vehicle, an electric vehicle, and the like, and a battery for electric power storage. The secondary battery includes an electrode assembly including a positive electrode and a negative electrode, a case accommodating the electrode assembly, and an electrode terminal connected to the electrode assembly. The ultrasonic welding device may be used for welding between a plurality of substrate tabs of the secondary battery and welding between the substrate tabs and the bar terminals. The ultrasonic welding device performs welding by applying heat and pressure to the welding target when the welding target is placed on the anvil and the welding target is pressed by the welding head in which the welding knurls protrude. In general, a plurality of substrate tabs are welded, and then strip terminals are welded again, and breakage may occur at a portion where the welded portions overlap. The above information disclosed in this background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art. Disclosure of Invention Embodiments of the present disclosure provide an ultrasonic welding apparatus capable of preventing damage or breakage of a welded portion by preventing overlapping of the welded portion during ultrasonic welding, and a method for manufacturing a secondary battery using the ultrasonic welding apparatus. However, technical problems to be achieved in the embodiments of the present disclosure are not limited to the above-mentioned technical problems, and other technical problems not mentioned herein will be clearly understood by those skilled in the art to which the present disclosure pertains from the following description. Embodiments of the present disclosure provide an ultrasonic welding apparatus for a secondary battery, including an anvil configured to support a welding target, and a welding head configured to be disposed above the welding target, the welding head including a main body, a head disposed on one end of the main body, and a plurality of welding knurls disposed on a surface of each of the heads, wherein each of the heads is in a first position upon primary welding of the welding target, wherein each of the heads is in a second position upon secondary welding of the welding target, and wherein the first and second positions are different from each other. In some embodiments, each of the heads is detachable or movable from the body. In some embodiments, the heads are provided as a pair, and the distance between the pair of heads in the first position is greater than the distance between the pair of heads in the second position. In some embodiments, each of the pair of heads includes a coupling portion, and wherein the body includes an insert portion corresponding to the coupling portion. In some embodiments, the weld heads are provided in pairs, and each weld head has a head. In some embodiments, the distance between the weld heads in the first position is greater than the distance between the weld heads in the second position. In some embodiments, the primary welded portion subjected to the primary welding and the secondary welded portion subjected to the secondary welding do not overlap each other. In some embodiments, the secondary weld is disposed between the two primary welds. In some embodiments, the primary welded portion and the secondary welded portion are each provided in an even number. Embodiments of the present disclosure provide a method for manufacturing a secondary battery using an ultrasonic welding device, the method including welding a negative electrode substrate tab of a negative electrode plate of an electrode assembly of the secondary battery to a first strip-shaped terminal using the ultrasonic welding device to electrically connect the first strip-shaped terminal to the negative electrode substrate tab, and welding a positive electrode substrate tab of a positive electrode plate of the electrod