Battery pack

Patent metadata

Field	Value
Publication number	US-10312478-B2
Application number	US-201514605145-A
Country	US
Kind code	B2
Filing date	Jan 26, 2015
Priority date	Apr 16, 2014
Publication date	Jun 4, 2019
Grant date	Jun 4, 2019

Abstract

A battery pack is disclosed. In one aspect, the battery pack includes an electrode assembly and a case accommodating the electrode assembly, wherein the case includes first and second walls facing each other and respectively concave and convex with respect to the electrode assembly. The battery pack also includes an uneven portion formed on the second wall.

First claim

What is claimed is:

1. A battery pack comprising:
an electrode assembly having an outer side surface, a top and a bottom opposing each other;
an electrode plate outwardly extending from the top of the electrode assembly;
a case accommodating the electrode assembly, wherein the case includes first and second walls opposing each other, wherein each of the first and second walls has an inner surface and an outer surface opposing each other, wherein the inner surface faces the outer side surface of the electrode assembly,
wherein at least a portion of the outer surface of the second wall is uneven, wherein the uneven portion defines a gap between the outer surface of the electrode assembly and the inner surface of the second wall, wherein the uneven portion extends in the width direction of the second wall of the case,
wherein the uneven portion comprises a plurality of protrusions and a plurality of recesses alternately formed with respect to each other, wherein each of the protrusions extends in the same direction in which the electrode plate extends,
wherein the outer surface of the second wall is configured to be deformed based on pressure applied to the case, wherein the thickness of each of the protrusions and recesses is configured to decrease by stretching in response to the outer surface of the second wall being deformed,
wherein each of the first and second walls has a predetermined radius of curvature, and
wherein the predetermined radius of curvature of the second wall is greater than the predetermined radius of curvature of the first wall.

2. The battery pack of claim 1 , wherein the protrusions and recesses are formed in a center portion of the second wall.

3. The battery pack of claim 1 , wherein the protrusions and recesses are symmetrical with respect to the center portion of the second wall.

4. The battery pack of claim 1 , wherein the thickness of a center portion of the second wall is less than the thickness of a center portion of the first wall.

5. The battery pack of claim 1 , wherein each of the first and second walls has a predetermined radius of curvature, and wherein the predetermined radius of curvature of the second wall is about 200 mm or greater.

6. The battery pack of claim 5 , wherein the difference between the predetermined radius of curvature of the first wall and the predetermined radius of curvature of the second wall is in the range from about 10 mm to about 30 mm.

7. The battery pack of claim 1 , wherein the electrode assembly is curved along the first and second walls.

8. The battery pack of claim 7 , further comprising:
a cap plate substantially sealing the electrode assembly inside the case; and
an electrode pin located on an upper surface of the cap plate and electrically connected to the electrode assembly.

9. The battery pack of claim 8 , wherein the electrode pin has a first polarity, and wherein the cap plate has a second polarity that is different from the first polarity.

10. The battery pack of claim 9 , wherein the cap plate comprises a first side corresponding to the first wall and a second side corresponding to the second wall,
wherein each of the first and second walls has a predetermined radius of curvature, wherein the first side of the cap plate has substantially the same radius of curvature as the first wall, and wherein the second side of the cap plate has substantially the same radius of curvature as the second wall.

11. The battery pack of claim 1 , wherein the second wall includes an even portion, and wherein each of the protrusions protrudes from the even portion.

12. The battery pack of claim 1 , wherein the protrusions are formed only on the second wall.

13. The battery pack of claim 1 , wherein the protrusions are formed only on part of the second wall.

14. The battery pack of claim 1 , wherein the length of the second wall is configured to increase in response to the thickness of each of the protrusions and recesses being reduced.

15. The battery pack of claim 1 , wherein the thickness of a center portion of the first wall is configured to increase in response to the outer surface of the second wall being deformed, and wherein the length of the first wall is configured to decrease in response to the thickness of the center portion of the first wall being increased.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Seong Jae-Il

Classifications

• H01M50/103 Primary

  prismatic or rectangular (H01M50/109, H01M50/11 take precedence) · CPC title

• H01M50/591

  Covers · CPC title

• H01M50/15

  for prismatic or rectangular cells (H01M50/153 takes precedence) · CPC title

• H01M50/553

  Terminals adapted for prismatic, pouch or rectangular cells · CPC title

• H01M50/55

  on the same side of the cell · CPC title