Battery, and battery pack and vehicle including the same

Patent metadata

Field	Value
Publication number	US-12136706-B2
Application number	US-202217579380-A
Country	US
Kind code	B2
Filing date	Jan 19, 2022
Priority date	Jan 19, 2021
Publication date	Nov 5, 2024
Grant date	Nov 5, 2024

Abstract

A battery, includes an electrode assembly having a first electrode, a second electrode and a separator, wherein each of the first electrode and the second electrode has a first portion including an active material corresponding to the separator, and a second portion exposed beyond the separator and not coated with the active material; a battery housing having a first end with a first opening and a second end with a second opening opposite the first end, the battery housing accommodating the electrode assembly through the second opening at the second end and electrically connected to the second portion of the second electrode; a terminal electrically connected to the second portion of the first electrode and exposed out of the battery housing through the first opening of the battery housing at the first end; and a cap covering and sealing the second opening at the second end of the battery housing.

First claim

What is claimed is:

1. A battery, comprising:
an electrode assembly having a first electrode, a second electrode and a separator between the first electrode and the second electrode, wherein the first electrode, the second electrode, and the separator are wound about an axis, and wherein each of the first electrode and the second electrode has a first portion including an active material corresponding to the separator, and a second portion exposed beyond the separator and not coated with the active material;
a battery housing having a first end with a first opening and a second end with a second opening opposite the first end, the battery housing accommodating the electrode assembly through the second opening at the second end and electrically connected to the second portion of the second electrode;
a terminal electrically connected to the second portion of the first electrode and exposed out of the battery housing through the first opening of the battery housing at the first end; and
a cap covering and sealing the second opening at the second end of the battery housing,
wherein the cap overlaps the battery housing at the second end in an axial direction of the battery housing, wherein the cap has no polarity, and
wherein the terminal has a first polarity and the battery housing has a second polarity.

2. The battery according to claim 1 ,
wherein the terminal penetrates the first opening of the battery housing at the first end.

3. The battery according to claim 1 , further comprising:
an insulating gasket between the battery housing and the terminal; and
a sealing gasket between the battery housing and the cap at an overlap of the cap and the battery housing at the second end to create an airtight seal based on the cap being interposed between portions of the sealing gasket,
wherein the insulating gasket is provided at the first end of the battery housing, and
wherein the cap seals the second opening at the second end of the battery housing.

4. The battery according to claim 1 ,
wherein a surface of the terminal exposed out of the battery housing serves as a first electrode terminal to which a first bus bar terminal is coupled, and
wherein a region of an outer surface of the first end of the battery housing, which is parallel to an upper surface of the first electrode terminal, serves as a second electrode terminal to which a second bus bar terminal is coupled.

5. The battery according to claim 4 ,
wherein the first bus bar terminal overlaps with the first electrode terminal on a plane to form a first overlapping region,
wherein the second bus bar terminal overlaps with the second electrode terminal on a plane to form a second overlapping region, and
wherein a diameter of the first electrode terminal and a width of the second electrode terminal satisfy the following formulas:
W 1 ≤E 1 ≤D− 2 R d −2 G− 2 W 2 , and

E 2 =0.5*( D− 2 R d −2 G−E 1 ),

wherein E 1 is a diameter of the terminal exposed out of the battery housing,
E 2 is a width of the region of the outer surface of the first end of the battery housing parallel to the upper surface of the terminal,
D is an outer diameter of the battery housing,
R d is a width of a round region at an edge of the battery housing measured on a plane,
G is an exposure width of an insulating gasket exposed out of an edge of the first electrode terminal on a plane,
W 1 is a maximum value among distances between arbitrarily selected two points at an edge of the first overlapping region; and W 2 is a maximum value among distances between two points at which a plurality of straight lines passing through a center of the first electrode terminal meet an edge of the second overlapping region.

6. The battery according to claim 4 ,
wherein an area occupied by the first electrode terminal is 2? to 30% compared to an area occupied by the second electrode terminal at the first end of the battery housing.

7. The battery according to claim 1 ,
wherein a form factor ratio obtained by dividing a diameter of the battery by a height of the battery is greater than 0.4.

8. The battery according to claim 1 ,
wherein at least a part of the second portion of the first electrode includes a plurality of segments divided along a winding direction of the electrode assembly, and
wherein the plurality of segments are bent along a radial direction of the electrode assembly.

9. The battery according to claim 8 ,
wherein the plurality of segments are overlapped in multiple layers along the radial direction.

10. The battery according to claim 9 ,
wherein the electrode assembly includes a welding target region in which the number of multiple layers that are overlapped of the plurality of segments of the second portion of the first electrode is kept constant along the radial direction of the electrode assembly.

11. The battery according to claim 10 ,
further comprising a first current collector coupled to the second portion of the first electrode of the electrode assembly and coupled to the terminal to electrically connect the second portion of the first electrode of the electrode assembly and the terminal, and
wherein the first current collector is coupled to the second portion of the first electrode at the welding target region.

12. The battery according to claim 1 ,
wherein at least a part of the second portion of the second electrode includes a plurality of segments divided along a winding direction of the electrode assembly, and
wherein the plurality of segments are bent along a radial direction of the electrode assembly.

13. The battery according to claim 12 ,
wherein the plurality of segments are overlapped in multiple layers along the radial direction.

14. The battery according to claim 13 ,
wherein the electrode assembly includes a welding target region in which the number of multiple layers that are overlapped of the plurality of segments of the second portion of the second electrode is kept constant along the radial direction of the electrode assembly.

15. The battery according to claim 14 ,
further comprising a second current collector coupled to the second portion of the second electrode of the electrode assembly and coupled to the battery housing to electrically connect the second portion of the second electrode of the electrode assembly and the battery housing, and wherein the second current collector is coupled to the second portion of the second electrode inside the welding target region.

16. The battery according to claim 1 ,
wherein the battery housing is made of a metal.

17. The battery according to claim 1 ,
wherein the battery housing has different thicknesses depending on locations.

18. The battery according to claim 1 ,
wherein a thickness of a sidewall of the battery housing is smaller than a thickness of the first end of the battery housing.

19. The battery according to claim 1 ,
wherein the first end of the battery housing has a thickness of approximately 0.4 mm to 1.2 mm.

20. The battery according to claim 1 ,
wherein a sidewall of the battery housing has a thickness of approximately 0.3 mm to 0.8 mm.

21. The battery according to claim 1 ,
wherein the battery has a nickel-plated layer formed on a surface of the battery housing.

22. The battery according to claim 21 ,
wherein the nickel-plated layer has a thickness of approximately 1.5 □m to 6.0 □m.

23. The battery according to claim 1 ,
wherein the battery housi

Assignees

• Lg Energy Solution Ltd

Inventors

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