Electrode assembly, battery, and battery pack and vehicle including the same

Patent metadata

Field	Value
Publication number	US-2024128517-A1
Application number	US-202218273010-A
Country	US
Kind code	A1
Filing date	Jan 19, 2022
Priority date	Jan 19, 2021
Publication date	Apr 18, 2024
Grant date	—

Abstract

Disclosed is an electrode assembly, a battery, and a battery pack and a vehicle including the same. In the electrode assembly, a first electrode, a second electrode, and a separator interposed therebetween are wound based on an axis to define a core and an outer circumference. The first electrode includes an uncoated portion at a long side end thereof and exposed out of the separator along a winding axis direction of the electrode assembly. A part of the uncoated portion is bent in a radial direction of the electrode assembly to form a bending surface region that includes overlapping layers of the uncoated portion, and in a partial region of the bending surface region, the number of stacked layers of the uncoated portion is 10 or more in the winding axis direction of the electrode assembly.

First claim

1 - 78 . (canceled)

79 . An electrode assembly in which a first electrode, a second electrode, and a separator interposed therebetween are wound based on an axis to define a core and an outer circumference,
wherein the first electrode includes an uncoated portion at a long side end thereof and exposed out of the separator along a winding axis direction of the electrode assembly, the uncoated portion of the first electrode is divided into a plurality of segments that are independently bendable, a part of the uncoated portion is bent in a radial direction of the electrode assembly to form a bending surface region that includes overlapping layers of the uncoated portion, and in a partial region of the bending surface region, the number of stacked layers of the uncoated portion is 10 or more in the winding axis direction of the electrode assembly, and when the number of total winding turns of the first electrode is defined as n 1 and a value obtained by dividing a winding turn index k (a natural number of 1 to n 1 ) at a k th winding turn location by the number of total winding turns n 1 is defined as a relative radial position R 1,k of the winding turn index k, a length ratio of a radial region of R 1,k satisfying a condition that the number of stacked layers of the uncoated portion is 10 or more is 30% or more based on a relative radial position region from a relative radial position of an innermost winding turn including a segment to a relative radial position of an outermost winding turn including a segment.

80 . The electrode assembly according to claim 79 ,
wherein the length ratio of the radial region of R 1,k satisfying a condition that the number of stacked layers of the uncoated portion is 10 or more is 30% to 85% based on the relative radial position region from a relative radial position of an innermost winding turn including a segment to a relative radial position of an outermost winding turn including a segment.

81 . The electrode assembly according to claim 79 ,
wherein the second electrode includes an uncoated portion at a long side end thereof and exposed out of the separator along the winding axis direction of the electrode assembly, the uncoated portion of the second electrode is divided into a plurality of segments that are independently bendable, a part of the uncoated portion is bent in the radial direction of the electrode assembly to form a bending surface region that includes overlapping layers of the uncoated portion, and in a partial region of the bending surface region, the number of stacked layers of the uncoated portion is 10 or more in the winding axis direction of the electrode assembly, and when the number of total winding turns of the second electrode is defined as n 2 and a value obtained by dividing a winding turn index k (a natural number of 1 to n 2 ) at a k th winding turn location by the number of total winding turns n 2 is defined as a relative radial position R 2,k of the winding turn index k, a length ratio of a radial region of R 2,k satisfying a condition that the number of stacked layers of the uncoated portion is 10 or more is 30% or more based on a relative radial position region from a relative radial position of an innermost winding turn including a segment to a relative radial position of an outermost winding turn including a segment.

82 . The electrode assembly according to claim 81 ,
wherein the length ratio of the radial region of R 2,k satisfying a condition that the number of stacked layers of the uncoated portion is 10 or more is 30% to 85% based on the relative radial position region from a relative radial position of an innermost winding turn including a segment to a relative radial position of an outermost winding turn including a segment.

83 . The electrode assembly according to claim 80 ,
wherein in the winding structure of the first electrode, the uncoated portion of a region from a relative radial position R 1,l of a 1 st winding turn to a first relative radial position of a preset k* th winding turn has a smaller height than the uncoated portion of a region from a relative radial position R 1,k*+1 of a k*+1 th winding turn to a relative radial position of an outermost winding turn including a segment, the uncoated portion of a region from a relative radial position R 1,l of a 1 st winding turn to a first relative radial position R 1,k* of a k* th winding turn is not bent toward the core of the electrode assembly, and the uncoated portion of a region from a relative radial position R 1,l of a 1 st winding turn to a first relative radial position R 1,k* of a preset k* th winding turn has a smaller height than the bending surface region formed by overlapping segments included in the relative radial position region from a relative radial position of an innermost winding turn including a segment to a relative radial position of an outermost winding turn including a segment.

84 . The electrode assembly according to claim 81 ,
wherein in the winding structure of the second electrode, the uncoated portion of a region from a relative radial position R 2,l of a 1 st winding turn to a first relative radial position R 2,k* of a preset k* th winding turn has a smaller height than the uncoated portion of a region from a relative radial position R 2,k*+1 of a k*+1 th winding turn to a relative radial position of an outermost winding turn including a segment, the uncoated portion of a region from a relative radial position R 2,l of a 1 st winding turn to a first relative radial position R 2,k* of a preset k* th winding turn is not bent toward the core of the electrode assembly, and the uncoated portion of a region from a relative radial position R 2,l of a 1 st winding turn to a first relative radial position R 2,k* of a preset k* th winding turn has a smaller height than the bending surface region formed by overlapping segments included in the relative radial position region from a relative radial position of an innermost winding turn including a segment to a relative radial position of an outermost winding turn including a segment.

85 . The electrode assembly according to claim 79 ,
wherein in the winding structure of the first electrode, when a radius of the core of the electrode assembly is defined as re, a region from a center of the core to 0.90r c is not blocked by a bent portion of the uncoated portion located in a region from a relative radial position R 1,k+1 of a k*+1 th winding turn to a relative radial position 1.

86 . The electrode assembly according to claim 81 ,
wherein in the winding structure of the second electrode, when a radius of the core of the electrode assembly is defined as r c , a region from a center of the core to 0.90r c is not blocked by a bent portion of the uncoated portion of the second electrode located in a region from a relative radial position R 2,k*+1 of a k*+1 th winding turn to a relative radial position 1.

87 . The electrode assembly according to claim 79 ,
wherein in the winding structure of the first electrode, the uncoated portion of a region from a relative radial position R 1,k*+1 of a k*+1 th winding turn to a second relative radial position R 1,k@ of a preset k@ th winding turn is divided into a plurality of segments, whose heights increase gradually or stepwise along one direction parallel to the winding direction, and a radial length of the region from the relative radial position R 1,k*+1 to the second relative radial position R 1,k@ is 1% to 56% compared to a radius of the winding structure of the first electrode except for the core of the electrode assembly.

88 . The electrode assembly according to claim 87 ,
wherein in the win

Assignees

• Lg Energy Solution Ltd

Inventors

• Lim Hae-Jin
• Kong Jin-Hak
• Lee Soon-O
• Choi Kyu-Hyun
• Kim Do-Gyun
• Choi Su-Ji
• Hwangbo Kwang-Su
• Min Geon-Woo
• Jo Min-Ki
• Lim Jae-Won
• Kim Hak-Kyun
• Lee Je-Jun
• Jung Ji-Min
• Kim Jae-Woong
• Park Jong-Sik
• Choe Yu-Sung
• Lee Byoung-Gu
• Ryu Duk-Hyun
• Lee Kwan-Hee
• Lee Jae-Eun
• Kang Bo-Hyun
• Park Pil-Kyu

Classifications

• H01M50/566

  by welding, soldering or brazing · CPC title

• H01M50/562

  characterised by the material · CPC title

• H01M50/59

  characterised by the protection means · CPC title

• H01M50/184

  characterised by their shape or structure · CPC title

• H01M50/531

  Electrode connections inside a battery casing · CPC title