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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 8993138 B1

PDFFull Text
Date of Patent:
Mar. 31, 2015

Filed:

Sep. 21, 2009

Rechargeable battery

Applicant:

Jin-hee Kim, Suwon-si, KR;

Inventor:

Jin-Hee Kim, Suwon-si, KR;

Assignee:

Samsung SDI Co., Ltd., Yongin-si, KR;

Attorney:

Christie, Parker & Hale, LLP

Primary Examiner:

Philip Tucker

Assistant Examiner:

Brian R Slawski

Int. Cl.
CPC ...
H01M 14/00 (2006.01); H01M 2/12 (2006.01); H01M 2/00 (2006.01); H01M 4/82 (2006.01); H01M 6/00 (2006.01); H01M 10/052 (2010.01); H01M 2/34 (2006.01); H01M 4/131 (2010.01); H01M 10/058 (2010.01); H01M 10/42 (2006.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01);
U.S. Cl.
CPC ...
H01M 10/052 (2013.01); H01M 2/1241 (2013.01); H01M 2/34 (2013.01); H01M 2/345 (2013.01); H01M 4/131 (2013.01); H01M 10/058 (2013.01); H01M 10/4235 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 2010/4292 (2013.01); H01M 2200/00 (2013.01); H01M 2200/20 (2013.01); Y02E 60/122 (2013.01); Y02T 10/7011 (2013.01);
Abstract

A rechargeable battery according to the present invention includes an electrode assembly that includes a positive electrode, a negative electrode, and a separator between the positive electrode and the negative electrode, a case that contains the electrode assembly and a cap assembly that is connected to the case. The positive electrode includes a current collector and a positive active material layer that includes an NCM-based positive active material disposed at the collector. The cap assembly includes a vent plate having a notch, and a current interrupt portion that interrupts electrical connection in a case of an increase in pressure inside the case. When a current interrupt pressure of the current interrupt portion is 'A,' a vent fracture pressure at which the vent plate fractures at the notch is 'B,' and the capacity of the rechargeable battery is “X,” they satisfy a formula of A/B=1.22−0.39X+D (−0.08≦D≦0.08).

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