US 12,070,813 B2
Electrode having improved electrode tab welding characteristics and secondary battery comprising the same
Tae Gon Kim, Daejeon (KR); Seung Yeop Seo, Daejeon (KR); Seong Kyun Shin, Daejeon (KR); Nam Kyu Lee, Daejeon (KR); and Ha Neuol Choi, Daejeon (KR)
Assigned to LG Energy Solution, Ltd., Seoul (KR)
Appl. No. 16/615,305
Filed by LG Chem, Ltd., Seoul (KR)
PCT Filed Jul. 12, 2018, PCT No. PCT/KR2018/007916
§ 371(c)(1), (2) Date Nov. 20, 2019,
PCT Pub. No. WO2019/050147, PCT Pub. Date Mar. 14, 2019.
Claims priority of application No. 10-2017-0115201 (KR), filed on Sep. 8, 2017.
Prior Publication US 2020/0185690 A1, Jun. 11, 2020
Int. Cl. H01M 50/538 (2021.01); B23K 20/10 (2006.01); H01M 4/02 (2006.01); H01M 50/536 (2021.01)
CPC B23K 20/10 (2013.01) [H01M 50/536 (2021.01); H01M 50/538 (2021.01); H01M 2004/027 (2013.01); H01M 2004/028 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A secondary battery electrode assembly, comprising:
a plurality of negative electrodes alternatingly interleaved with a plurality of positive electrodes in a vertical stack, with respective separators disposed between adjacent ones of the electrodes;
a plurality of non-coated electrode tabs, each of the plurality of non-coated electrode tabs extending from a respective one of the electrodes having a first same polarity that is either negative or positive, the plurality of non-coated electrode tabs being arranged in first and second spaced-apart vertical stacks so that the tabs in the first vertical stack overlap each other and the tabs in the second vertical stack overlap each other, such that the electrode tabs in the first vertical stack extend from a first odd-numbered half of the electrodes having the first same polarity, and the electrode tabs in the second vertical stack extend from a second even-numbered half of the electrodes having the first same polarity; and
an electrode lead having a flat planar shape defining a major surface parallel to respective planes in which the negative electrodes and positive electrodes extend, the electrode tabs in the first vertical stack being coupled to the electrode lead at a first location, the electrode tabs in the second vertical stack being coupled to the electrode lead at a second location, the tabs in the first vertical stack being spaced apart from the tabs in the second vertical stack by a predetermined distance, the predetermined distance being equal to or greater than a width of the tabs in the first vertical stack and a width of the tabs in the second vertical stack,
wherein a lower end of the electrode lead that is welded to the electrode tabs is shaped so that the first and second locations are at first and second portions of the lower end of the electrode lead that are separated from one another by the predetermined distance,
wherein a length of each of the first and second portions of the lower end of the electrode lead extends from a lower edge of the electrode lead to an intermediate portion of the electrode lead that is spaced apart from the lower edge and spaced apart from a central region of the electrode lead that is configured to be affixed to a sealing part of a pouch-shaped battery case by an insulating tape, and
wherein a width of each of the first and second portions of the lower end of the electrode lead is greater than or equal to the width of the tabs in the first vertical stack and the width of the tabs in the second vertical stack.