US 7,803,483 B2Granted

Hermetically sealed high capacity nonaqueous electrolyte battery and battery pack with the same

AssigneeKabushiki Kaisha Toshiba

InventorsNorio Takami, Hiroki Inagaki

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Abstract

A nonaqueous electrolyte battery includes a positive electrode, a negative electrode and a case formed of a film and including a heat sealed section formed on at least one edge portion of the case. The negative electrode contains a negative electrode active material having a lithium ion insertion potential not lower than 0.4V (vs. Li/Li+). The nonaqueous electrolyte battery also includes positive and negative electrode terminals. A first alumina layer having projections and recesses is formed on at least one part of a seal portion of the positive electrode terminal. A second alumina layer having projections and recesses is formed on at least one part of a seal portion of the negative electrode terminal. Further, the positive and negative electrode terminals have a cross sectional area S (mm2) which satisfies 0.6Q≦S≦2Q.

Claims19

Dependent claims

A nonaqueous electrolyte battery, comprising:

a case formed of a film and including a heat sealed section formed on an edge portion of the case;
a nonaqueous electrolyte provided in the case;
a positive electrode provided in the case and containing a positive electrode current collector formed of an aluminum foil or an aluminum alloy foil;
a negative electrode provided in the case and containing a negative electrode active material having a lithium ion insertion potential not lower than 0.4 V (vs. Li/Li+), and the negative electrode containing a negative electrode current collector formed of an aluminum foil or an aluminum alloy foil;
a positive electrode terminal including a tip portion withdrawn to an outside of the case via the heat sealed section of the case, and a seal portion being positioned in the heat sealed section, and the positive electrode terminal being made of aluminum or aluminum alloy and electrically connected to the positive electrode;
a first alumina layer having projections and recesses and formed on the seal portion of the positive electrode terminal;
a negative electrode terminal including a tip portion withdrawn to the outside of the case via the heat sealed section of the case, and a seal portion being positioned in the heat sealed section, and the negative electrode terminal being made of aluminum or aluminum alloy and electrically connected to the negative electrode;
and
a second alumina layer having projections and recesses and formed on the seal portion of the negative electrode terminal,
wherein the positive electrode terminal and the negative electrode terminal have a cross sectional area S (mm2) which satisfies the formula (1) given below:
0.6Q≦S≦2Q (1)
where Q denotes a rated capacity (Ah) of the nonaqueous electrolyte battery, which falls within a range of 1 to 50 Ah.

9 more elements

A battery pack comprising a battery module comprising nonaqueous electrolyte batteries, each of the nonaqueous electrolyte batteries comprising:

a case formed of a film and including a heat sealed section formed on an edge portion of the case;
a nonaqueous electrolyte provided in the case;
a positive electrode provided in the case and containing a positive electrode current collector formed of an aluminum foil or an aluminum alloy foil;
a negative electrode provided in the case and containing a negative electrode active material having a lithium ion insertion potential not lower than 0.4 V (vs. Li/Li+), and the negative electrode containing a negative electrode current collector formed of an aluminum foil or an aluminum alloy foil;
a positive electrode terminal including a tip portion withdrawn to an outside of the case via the heat sealed section of the case, and a seal portion being positioned in the heat sealed section, and the positive electrode terminal being made of aluminum or aluminum alloy and electrically connected to the positive electrode;
a first alumina layer having projections and recesses and formed on the seal portion of the positive electrode terminal;
a negative electrode terminal including a tip portion withdrawn to the outside of the case via the heat sealed section of the case, and a seal portion being positioned in the heat sealed section, and the negative electrode terminal being made of aluminum or aluminum alloy and electrically connected to the negative electrode;
and
a second alumina layer having projections and recesses and formed on the seal portion of the negative electrode terminal,
wherein the positive electrode terminal and the negative electrode terminal have a cross sectional area S (mm2) which satisfies the formula (1) given below:
0.6Q≦S≦2Q (1)
where Q denotes a rated capacity (Ah) of the nonaqueous electrolyte battery, which falls within a range of 1 to 50 Ah.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/260,435Filed 28 Oct 2005
Priority: JP 2005-1994447 Jul 2005
Published: US 2007/0009794 A111 Jan 2007
Granted: 28 Sep 2010
Term ends: Not estimatedThe source records don’t support an estimate.

Classification21 codes

H01M 4/505
Of manganese: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
H01M 4/485
Of inorganic oxides or hydroxides: of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy
H01M 4/525
Of nickel, cobalt or iron: of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g.…
H01M 4/661
Selection of materials: metal or alloys, e.g. alloy coatings