Electrode Having Improved Electrode Tab Welding Characteristics and Secondary Battery Comprising the Same

Patent metadata

Field	Value
Publication number	US-2025025957-A1
Application number	US-202418789074-A
Country	US
Kind code	A1
Filing date	Jul 30, 2024
Priority date	Sep 8, 2017
Publication date	Jan 23, 2025
Grant date	—

Abstract

An apparatus for welding a secondary battery electrode assembly is disclosed. The electrode assembly may have negative electrodes alternatingly interleaved with positive electrodes. The apparatus may be configured to weld a plurality of non-coated electrode tabs using a sonotrode horn, each of the tabs extending from a respective one of the electrodes having a first same polarity. The sonotrode horn may include a vibration-applying plate and a horn pattern region having a protrusion-type unit pitch pattern disposed on the vibration-applying plate. A radius of curvature of a side surface of the protrusion-type unit pitch pattern disposed at an outer edge of the horn pattern region may be directly proportional to a number of the non-coated electrode tabs. A tip sharpness of the protrusion-type unit pitch pattern disposed at an outer edge of the horn pattern region may be inversely proportional to a number of the non-coated electrode tabs.

First claim

1 . An apparatus for welding a secondary battery electrode assembly having a plurality of negative electrodes alternatingly interleaved with a plurality of positive electrodes in a vertical stack, with separators disposed between adjacent ones of the electrodes, the apparatus being configured to weld a plurality of non-coated electrode tabs using a sonotrode horn, each of the tabs extending from a respective one of the electrodes having a first same polarity, the sonotrode horn comprising:
a vibration-applying plate; and a horn pattern region having a protrusion-type unit pitch pattern disposed on the vibration-applying plate, and wherein a radius of curvature of a side surface of the protrusion-type unit pitch pattern disposed at an outer edge of the horn pattern region is directly proportional to a number of the non-coated electrode tabs.

2 . The apparatus according to claim 1 , wherein, in the case in which the protrusion-type unit pitch pattern comes into contact with the non-coated electrode tabs and/or an electrode lead for welding, an inscribed radius of the protrusion-type unit pitch pattern that is formed together with the non-coated electrode tabs and/or the electrode lead is directly proportional to the number of the non-coated electrode tabs.

3 . The apparatus according to claim 1 , wherein the protrusion-type unit pitch pattern is a hemispherical protruding pattern having a curvature formed at a side wall surface thereof.

4 . An apparatus for welding a secondary battery electrode assembly having a plurality of negative electrodes alternatingly interleaved with a plurality of positive electrodes in a vertical stack, with separators disposed between adjacent ones of the electrodes, the apparatus being configured to weld a plurality of non-coated electrode tabs using a sonotrode horn, each of the tabs extending from a respective one of the electrodes having a first same polarity, the sonotrode horn comprising:
a vibration-applying plate; and a horn pattern region having a protrusion-type unit pitch pattern disposed on the vibration-applying plate, and wherein a tip sharpness of the protrusion-type unit pitch pattern disposed at an outer edge of the horn pattern region is inversely proportional to a number of the non-coated electrode tabs.

5 . The apparatus according to claim 4 , wherein, in the case in which the protrusion-type unit pitch pattern comes into contact with the non-coated electrode tabs and/or an electrode lead for welding, an inscribed radius of the protrusion-type unit pitch pattern that is formed together with the non-coated electrode tabs and/or the electrode lead is directly proportional to the number of the non-coated electrode tabs.

6 . The apparatus according to claim 4 , wherein the protrusion-type unit pitch pattern is a hemispherical protruding pattern having a curvature formed at a side wall surface thereof.

Assignees

• Lg Energy Solution Ltd

Inventors

• Kim Tae Gon
• Seo Seung Yeop
• Shin Seong Kyun
• Lee Nam Kyu
• Choi Ha Neuol

Classifications

• H01M50/536

  characterised by the method of fixing the leads to the electrodes, e.g. by welding · CPC title

• H01M50/538 Primary

  Connection of several leads or tabs of wound or folded electrode stacks · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title