Battery cell

Patent metadata

Field	Value
Publication number	US-2016104872-A1
Application number	US-201414894566-A
Country	US
Kind code	A1
Filing date	Jun 27, 2014
Priority date	Jul 5, 2013
Publication date	Apr 14, 2016
Grant date	—

Abstract

Battery cell 1 in the present invention includes, within flexible outer case 10 , an electrolyte solution, and battery assembly 4 in which positive electrodes 6 and negative electrodes 7 are alternately laminated so as to sandwich separators 8 therebetween. Battery cell 1 includes positive electrode terminal 2 that has one end electrically connected with positive electrodes 6 and that has the other end which extends to outside of outer case 10 , and negative electrode terminal 3 that has one end electrically connected with negative electrodes 7 and that has the other end that extends outside outer case 10 . In battery assembly 4 , fixation members 5 are provided on a pair of opposite lateral surfaces as viewed in a laminating direction of positive electrodes 6 and negative electrodes 7.

First claim

1 . A battery cell comprising:
a battery assembly that is contained within a flexible outer case and in which a positive electrode and a negative electrode are alternately laminated so as to sandwich a separator therebetween; an electrolyte solution that is contained within said outer case; a positive electrode terminal that has one end electrically connected with said positive electrode and that has the other end which extends to outside of said outer case; a negative electrode terminal that has one end electrically connected with said negative electrode and that has the other end which extends to outside of said outer case; and fixation members that are respectively provided on a pair of opposite lateral surfaces of said battery assembly as viewed from above in a laminating direction of said positive electrode and said negative electrode.

2 . The battery cell according to claim 1 , wherein said fixation members fix said separator, said positive electrode, and said negative electrode that are laminated.

3 . The battery cell according to claim 1 , wherein said separators, which overlaps each other so as to sandwich said positive electrode therebetween, have respective edge parts which are partially joined to each other and have a bag shape allowing said positive electrode to be contained therein.

4 . The battery cell according to claim 1 , wherein said separator is formed such that a thermal shrinkage ratio in a direction parallel to a direction in which said positive electrode terminal and said negative electrode terminal extend, is lower than a thermal shrinkage ratio in a direction perpendicular to the direction in which said positive electrode terminal and said negative electrode terminal extend.

5 . The battery cell according to claim 1 , wherein widths of said positive electrode terminal and said negative electrode terminal are smaller than widths of sides of said battery assembly from which said positive electrode terminal and said negative electrode terminal extend, as viewed from above in the laminating direction.

6 . The battery cell according to claim 1 , wherein said positive electrode terminal and said negative electrode terminal extend from opposite lateral surfaces of said battery assembly.

7 . The battery cell according to claim 1 , wherein the pair of lateral surfaces of said battery assembly on which said fixation members are provided are different from the lateral surfaces from which said positive electrode terminal and said negative electrode terminal extend.

8 . The battery cell according to claim 1 , wherein the fixation members provided on the pair of opposite lateral surfaces of said battery assembly are provided at regions respectively spreading from a pair of sides of the lateral surfaces toward centers of the lateral surfaces, and each surface area of the regions is 25% or less of a total surface area of the lateral surface, the pair of sides of the lateral surfaces extending in the laminating direction.

9 . The battery cell according to claim 1 , wherein a volume of a battery assembly containing part of said outer case that contains said battery assembly is larger than a volume of said battery assembly by 10% or more.

Assignees

• Nec Energy Devices Ltd

Inventors

• Shiraishi Shoichiro

Classifications

• H01M10/0468 Primary

  Compression means for stacks of electrodes and separators · CPC title

• H01M2220/30

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

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M50/548

  on opposite sides of the cell · CPC title

• H01M50/14

  for protecting against damage caused by external factors · CPC title