Secondary battery

Patent metadata

Field	Value
Publication number	US-9893338-B2
Application number	US-201514645286-A
Country	US
Kind code	B2
Filing date	Mar 11, 2015
Priority date	Apr 14, 2014
Publication date	Feb 13, 2018
Grant date	Feb 13, 2018

Abstract

A secondary battery includes a contact portion on a bottom retainer that contacts a bottom of a case, thus performing a tension function. The secondary battery includes an electrode assembly having a first electrode, a second electrode, and a separator between the first and second electrodes; a case accommodating the electrode assembly therein, having a top and a bottom and an opening in the top of the case; a cap plate closing the opening of the case; a bottom retainer on an upper surface of the bottom of the case, the bottom retainer including a support portion supporting the electrode assembly and at least one contact portion contacting the bottom of the case. As such, the contact portion may absorb external shocks, thus increasing durability and enhancing safety of the secondary battery.

First claim

What is claimed is:

1. A secondary battery, comprising:
an electrode assembly comprising a first electrode, a second electrode, and a separator between the first and second electrodes;
a bottom retainer;
a case having a top and a bottom, and accommodating the electrode assembly and the bottom retainer therein, the bottom retainer being on the bottom of the case; and
a cap plate sealing the top of the case;
wherein the bottom retainer comprises:
a planar support portion supporting the electrode assembly and being entirely spaced from the bottom of the case, a lowermost portion of the electrode assembly being above an uppermost portion of the support portion;
at least one contact portion extending from the support portion towards the bottom of the case to space the support portion from the bottom, wherein the at least one contact portion contacts the bottom of the case; and
at least one opening on the support portion through which electrolyte can flow to the bottom of the case.

2. The secondary battery of claim 1 , wherein the support portion of the bottom retainer is substantially flat and plate-shaped.

3. The secondary battery of claim 2 , wherein the contact portion of the bottom retainer extends from a bottom surface of the support portion toward the bottom of the case.

4. The secondary battery of claim 3 , wherein the contact portion comprises an inclined portion that extends obliquely from the support portion toward the bottom of the case, and a horizontal portion that extends from an end of the inclined portion and parallel to the bottom of the case.

5. The secondary battery of claim 4 , wherein the contact portion comprises two inclined portions adjacent to each other, the inclined portions adjacent to each other being inclined and spaced apart a first distance at a portion adjacent the support portion and spaced apart a second distance at a portion adjacent the horizontal portion, wherein the second distance is greater than the first distance.

6. The secondary battery of claim 1 , wherein the opening is located above the contact portion.

7. The secondary battery of claim 1 , wherein at least a portion of an edge of the opening has a wave pattern.

8. The secondary battery of claim 1 , wherein at least a portion of an edge of the support portion has a wave pattern.

9. The secondary battery of claim 1 , wherein the support portion and the contact portion are alternately arranged, and wherein a vertical section of the bottom retainer contacting a side of the case is embossed.

10. The secondary battery of claim 1 , wherein the bottom retainer comprises an insulation member.

11. The secondary battery of claim 1 , wherein the support portion comprises:
a first planar support portion supporting the electrode assembly; and
a second planar support portion supporting the electrode assembly, and
wherein the at least one contact portion is located between the first planar support portion and the second planar support portion.

12. The secondary battery of claim 1 , wherein the case has a length in a first direction and a width in a second direction crossing the first direction, the length of the case being greater than the width of the case, and
wherein the at least one contact portion extends from the support portion along the first direction.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Kwak Seung Ho
• Seo Yong Chul
• Guen Min Hyung

Classifications

• H01M10/0468 Primary

  Compression means for stacks of electrodes and separators · CPC title

• H01M10/4235

  Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence) · CPC title

• H01M50/103 Primary

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

• H01M50/469

  tubular or cylindrical · CPC title

• H01M2/10

  Electricity · mapped topic