Nonaqueous electrolyte battery including a sealed case, battery pack and storage battery apparatus

Patent metadata

Field	Value
Publication number	US-9859536-B2
Application number	US-201414579075-A
Country	US
Kind code	B2
Filing date	Dec 22, 2014
Priority date	Dec 26, 2013
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

A nonaqueous electrolyte battery of the embodiment includes: an electrode group; a pair of electrode leads connected electrically to the positive electrode and the negative electrode of the electrode group; a battery case comprising an electrode group-housing part which houses the electrode group, a terminal-housing part which communicates with the electrode group-housing part and houses the respective electrode leads, and a welded sealing part which seals the electrode group-housing part and the terminal-housing part, wherein a through hole exposing a part of the respective electrode leads is formed on the terminal-housing part; and a resin sealant which seals a space between the terminal-housing part and the electrode leads exposed by the through hole, wherein the resin sealant is circularly provided in the through hole along the peripheral part of the through hole and is formed of a resin composition having a coefficient of thermal expansion within 8-50 (×10 −6 /K) at 0° C. to 100° C.

First claim

The invention claimed is:

1. A nonaqueous electrolyte battery comprising:
an electrode group having a positive electrode and a negative electrode;
a pair of plate-shaped terminal parts connected electrically to the positive electrode and the negative electrode of the electrode group;
a metallic battery case comprising an electrode group-housing part which houses the electrode group, a terminal-housing part which communicates with the electrode group-housing part and houses the terminal part, and a welded sealing part which seals the electrode group-housing part and the terminal-housing part, wherein a through hole exposing a part of the terminal part is formed on the terminal-housing part; and
a resin sealant which seals a space between the terminal-housing part and the terminal part exposed by the through hole,
wherein the end part of the pair of plate-shaped terminal parts are accommodated in the terminal-housing part, the battery case is comprised of a first casing unit and a second casing part which are joined by the welded sealing part,
the terminal-housing part is comprised of a plate-shaped fixing part which is extended from the electrode group-housing part of the first casing unit and a plate-shaped fixing part which is extended from the electrode group-housing part of the second casing part,
the respective fixing parts face each other across the terminal part,
the terminal part is fixed by the respective fixing parts,
the through hole is formed in at least one of the plate-shaped fixing part of the first casing unit and the plate-shaped fixing part of the second casing part, and
the resin sealant is provided in a ring shape in the through hole along the peripheral part of the through hole and is formed of a thermosetting resin composition having a coefficient of thermal expansion within a range of 8 to 50 (×10 −6 /K) at 0° C. to 100° C.

2. The nonaqueous electrolyte battery according to claim 1 , wherein the thermosetting resin composition has a glass transition temperature of 120° C. or higher.

3. The nonaqueous electrolyte battery according to claim 1 , wherein the thermosetting resin composition is an epoxy based resin composition containing an inorganic filler.

4. The nonaqueous electrolyte battery according to claim 1 , wherein an insulating resin layer is interposed between the fixing part and the terminal part.

5. The nonaqueous electrolyte battery according to claim 4 , wherein the insulating resin layer is bonded, crimped or heat-sealed to the fixing part and the terminal part.

6. The nonaqueous electrolyte battery according to claim 1 , wherein the terminal-housing part is bent toward the electrode group-housing part.

7. The nonaqueous electrolyte battery according to claim 1 , wherein there are two terminal-housing parts, the terminal part connected to the positive electrode is present in one terminal-housing part, and the terminal part connected to the negative electrode is present in the other terminal-housing part.

8. The nonaqueous electrolyte battery according to claim 1 , wherein the electrode group-housing part and the terminal-housing part are enclosed by the welded sealing part.

9. A battery pack comprising:
the plural nonaqueous electrolyte batteries according to claim 1 ; and
a bus bar which electrically connects the terminal parts of the nonaqueous electrolyte batteries, wherein
the bus bar is connected to the terminal parts, which are exposed by the through holes, of the terminal parts of the nonaqueous electrolyte batteries.

10. A storage battery apparatus comprising:
the battery pack according to claim 9 ; and
an exterior package which houses the battery pack.

11. The nonaqueous electrolyte battery according to claim 1 , wherein the battery case is made from any one of the group consisting of stainless steel, nickel-plated stainless steel, and nickel-plated steel plate.

12. The nonaqueous electrolyte battery according to claim 1 , wherein the negative electrode includes a negative electrode layer that includes a negative electrode active material, and
wherein the negative electrode active material is made of titanium-containing metal composite oxides, or titanium-based oxides.

13. The nonaqueous electrolyte battery according to claim 1 , wherein the welded sealing part is sealed by seam welding.

Assignees

• Toshiba Kk

Inventors

• Isozaki Yoshiyuki
• Takami Norio
• Hotta Yasuyuki

Classifications

• H01M50/507 Primary

  comprising an arrangement of two or more busbars within a container structure, e.g. busbar modules · CPC title

• H01M50/224

  Metals · CPC title

• H01M50/522

  Inorganic material · CPC title

• H01M50/211

  adapted for pouch cells · CPC title

• H01M50/178

  for pouch or flexible bag cells · CPC title