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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 10044072 B1

PDFFull Text
Date of Patent:
Aug. 07, 2018

Filed:

Feb. 25, 2014

Lithium secondary battery pack, as well as electronic device, charging system, and charging method using said pack

Applicant:

Maxwell Holdings, Ltd., Otokuni-gun, Kyoto, JP;

Inventors:

Haruki Kamizori, Ibaraki, JP;

Masayuki Yamada, Ibaraki, JP;

Fusaji Kita, Ibaraki, JP;

Assignee:

MAXELL HOLDINGS, LTD., Kyoto, JP;

Attorney:

Birch, Stewart, Kolasch & Birch, LLP

Primary Examiner:

James Lee

Int. Cl.
CPC ...
H01M 10/0525 (2010.01); H02J 7/00 (2006.01); H01M 10/42 (2006.01); H01M 4/48 (2010.01); H01M 10/052 (2010.01); H01M 2/10 (2006.01); H01M 4/38 (2006.01); H01M 10/0585 (2010.01); H01M 10/44 (2006.01); H01M 10/637 (2014.01); H01M 4/587 (2010.01); H01M 10/46 (2006.01);
U.S. Cl.
CPC ...
H01M 10/425 (2013.01); H01M 2/1061 (2013.01); H01M 4/386 (2013.01); H01M 4/48 (2013.01); H01M 4/483 (2013.01); H01M 4/587 (2013.01); H01M 10/052 (2013.01); H01M 10/0525 (2013.01); H01M 10/0585 (2013.01); H01M 10/441 (2013.01); H01M 10/46 (2013.01); H01M 10/637 (2015.04); H02J 7/00 (2013.01); H02J 7/0013 (2013.01); H01M 2010/4271 (2013.01); H01M 2200/106 (2013.01); H01M 2220/30 (2013.01); Y02T 10/7011 (2013.01);
Abstract

A lithium secondary battery pack of the present invention includes: a lithium secondary battery including an electrode body formed of a positive electrode and a negative electrode facing each other and a separator interposed therebetween, and a non-aqueous electrolyte; a PTC element; and a protection circuit including a field effect transistor. The lithium secondary battery has an energy density per volume of 450 Wh/L or more, the lithium secondary battery has a current density of 3.0 mA/cmor less, and a relational expression (1) and a relational expression (2) below are established where A (mΩ) is an impedance of the lithium secondary battery and B (mΩ) is an impedance of the entire circuit unit of the lithium secondary battery pack excepting the impedance A (mΩ) of the lithium secondary battery:≤50 mΩ  (1)≤1  (2).

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