Non-aqueous electrolyte secondary battery

Patent metadata

Field	Value
Publication number	US-2016133995-A1
Application number	US-201414900542-A
Country	US
Kind code	A1
Filing date	Jun 10, 2014
Priority date	Jul 1, 2013
Publication date	May 12, 2016
Grant date	—

Abstract

A nonaqueous electrolyte secondary battery includes a positive electrode plate including a positive electrode core and a positive electrode mixture layer formed thereon; a negative electrode plate including a negative electrode core and a negative electrode mixture layer formed thereon; a wound electrode assembly in which the positive electrode plate and the negative electrode plate are wound with a separator therebetween so as to be insulated from each other; a nonaqueous electrolyte solution; a pressure-responsive current interruption mechanism electrically connected to at least one of the positive electrode plate and the negative electrode plate; and an outer casing. Excess electrolyte solution is present outside the electrode assembly in the outer casing. The liquid level of the excess electrolyte solution is at such a height that the excess electrolyte solution does not come into contact with a component of the current interruption mechanism when the outer casing is placed horizontally.

First claim

1 . A nonaqueous electrolyte secondary battery comprising:
a positive electrode plate including a positive electrode core and a positive electrode mixture layer formed thereon; a negative electrode plate including a negative electrode core and a negative electrode mixture layer formed thereon; a wound electrode assembly in which the positive electrode plate and the negative electrode plate are wound with a separator therebetween so as to be insulated from each other; a nonaqueous electrolyte solution; a pressure-responsive current interruption mechanism electrically connected to at least one of the positive electrode plate and the negative electrode plate; and an outer casing, wherein excess electrolyte solution is present outside the electrode assembly in the outer casing, and the liquid level of the excess electrolyte solution is at such a height that the excess electrolyte solution does not come into contact with a component of the current interruption mechanism when the outer casing is placed horizontally.

2 . The nonaqueous electrolyte secondary battery according to claim 1 , wherein
the current interruption mechanism comprises a conductive member having a recess and an inversion plate welded to the conductive member so as to seal an opening of the recess in the conductive member, and the liquid level of the excess electrolyte solution is at such a height that the excess electrolyte solution does not come into contact with the conductive member or the inversion plate when the outer casing is placed horizontally.

3 . The nonaqueous electrolyte secondary battery according to claim 2 , wherein
the conductive member includes a tubular portion, and the inversion plate is welded to an end of the tubular portion so as to seal an opening of the tubular portion.

4 . The nonaqueous electrolyte secondary battery according to claim 2 , wherein the positive electrode mixture layer contains lithium carbonate.

5 . The nonaqueous electrolyte secondary battery according to claim 4 , wherein lithium carbonate is present in the positive electrode mixture layer in an amount of 0.1% to 5% by mass of the positive electrode mixture.

6 . The nonaqueous electrolyte secondary battery according to claim 5 , wherein the outer casing is prismatic.

Assignees

• Sanyo Electric Co

Inventors

• Hattori Takayuki
• Yamauchi Yasuhiro

Classifications

• H01M50/574

  Devices or arrangements for the interruption of current · CPC title

• H01M10/0587

  of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators · CPC title

• H01M4/62

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title

• H01M2200/20

  Pressure-sensitive devices · CPC title

• H01M10/4235 Primary

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