Lithium ion secondary battery

Patent metadata

Field	Value
Publication number	US-9666903-B2
Application number	US-201414762457-A
Country	US
Kind code	B2
Filing date	Feb 28, 2014
Priority date	Mar 1, 2013
Publication date	May 30, 2017
Grant date	May 30, 2017

Abstract

There is provided a cylindrical pin-type lithium-ion secondary battery having excellent high temperature storage characteristics and charge-discharge cycle characteristics. The battery includes: a bottom-closed cylindrical battery case having an opening portion; a wound-type electrode assembly and a non-aqueous electrolyte housed in the battery case; and a sealing plate sealing the opening portion. The battery has: an outer diameter R of 3 to 6.5 mm; a height H of 15 to 65 mm; an amount of the non-aqueous electrolyte per discharge capacity of 1 mAh of 1.7 to 2.8 μL; and a packing ratio of 71 to 85%.

First claim

The invention claimed is:

1. A lithium-ion secondary battery having a cylindrical shape and comprising:
a bottom-closed cylindrical battery case having an opening portion;
a wound-type electrode assembly and a non-aqueous electrolyte housed in the battery case; and
a sealing plate sealing the opening portion,
the wound-type electrode assembly including:
a positive electrode;
a negative electrode; and
a separator interposed between the positive electrode and the negative electrode, and
the lithium-ion secondary battery having:
an outer diameter R of 3 to 6.5 mm and a height H of 15 to 65 mm;
an amount of the non-aqueous electrolyte per discharge capacity of 1 mAh of 1.7 to 2.8 μL;
a packing ratio of 71 to 85%, and
a capacity density per volume of 60 to 110 mAh/cm 3 .

2. The lithium-ion secondary battery according to claim 1 , wherein the packing ratio is 71 to 83%.

3. The lithium-ion secondary battery according to claim 1 , wherein an occupying ratio of the electrode assembly occupying an internal volume of the lithium-ion secondary battery is 43 to 54 vol %.

4. The lithium-ion secondary battery according to claim 1 , wherein the amount of the non-aqueous electrolyte per discharge capacity of 1 mAh is 1.8 to 2.7 μL.

5. The lithium-ion secondary battery according to claim 1 , wherein the amount of the non-aqueous electrolyte per discharge capacity of 1 mAh is 1.8 to 2.4 μL.

6. The lithium-ion secondary battery according to claim 1 , wherein the number of winding turns for the electrode assembly is 3 to 10.

7. The lithium-ion secondary battery according to claim 1 ,
wherein the opening portion of the battery case is sealed with the sealing plate by bending an opening edge portion of the battery case inward toward the sealing plate, with a gasket interposed between the opening portion and the sealing plate, and
an insulating layer formed of an electrical insulating material is disposed on at least an outer surface of the bent opening edge portion and a portion peripheral to the bent opening edge portion.

8. A lithium-ion secondary battery having a cylindrical shape and comprising:
a bottom-closed cylindrical battery case having an opening portion;
a wound-type electrode assembly and a non-aqueous electrolyte housed in the battery case; and
a sealing plate sealing the opening portion,
the wound-type electrode assembly including:
a positive electrode;
a negative electrode; and
a separator interposed between the positive electrode and the negative electrode, and
the lithium-ion secondary battery having:
an outer diameter R of 3 to 6.5 mm and a height H of 15 to 65 mm;
an amount of the non-aqueous electrolyte per discharge capacity of 1 mAh of 1.7 to 2.8 μL; and
a packing ratio of 71 to 85%,
wherein a ratio of a distance h between a bottom surface of the sealing plate and an upper end surface of the electrode assembly relative to the outer diameter R: h/R, is 0.1 to 1.7.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Sano Yoko
• Yoneda Keisuke

Classifications

• H01M50/167

  by crimping · CPC title

• H01M2/046

  Electricity · mapped topic

• H01M10/0587

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

• H01M2220/30

  Batteries in portable systems, e.g. mobile phone, laptop · CPC title

• H01M2/022

  Electricity · mapped topic