Electrochemical device
Electrochemical device 1 includes: electric storage element 5 that includes positive electrode 2 , negative electrode 3 and a plurality of separators 4 , positive electrode 2 and negative electrode 3 overlapping each other with separators 4 interposed therebetween; and outer container 8 that is composed of flexible film 7 , outer container 8 containing electric storage element 5 . Separators 4 include adhesive separator 4 a and heat-resistant separator 4 b whose melting point is higher than the melting point of adhesive separator 4 a , and at least a part of adhesive separator 4 a is welded to flexible film 7 that makes up outer container 8.
1. An electrochemical device comprising:
an electric storage element that includes a positive electrode, a negative electrode and a plurality of separators, said positive electrode and said negative electrode overlapping, each other with said separators interposed therebetween; and
an outer container that is composed of a flexible film, the outer container containing said electric storage element, wherein
said separators include an adhesive separator and a heat-resistant separator whose melting point is higher than the melting point of said adhesive separator, and at least a part of said adhesive separator is welded to said flexible film that comprises said outer container,
the adhesive separator and the heat-resistant separator which extend from an electrode laminated body of the electric storage element, and the flexible film which comprises the outer container, are thermally welded to each other,
at least one of said separators is disposed between said positive electrode and said negative electrode,
at least one of said separators is disposed as an outermost layer of said electric storage element,
said separator disposed as the outermost layer of said electric storage element is said adhesive separator is welded to said flexible film, and
said separator disposed between said positive electrode and said negative electrode is said heat-resistant separator.
2. The electrochemical device according to claim 1 , wherein said heat-resistant separator is composed of a resin whose melting point is 300° C. or higher.
3. The electrochemical device according to claim 1 , wherein a difference in melting points between said adhesive separator and said flexible film is up to 20° C.
4. The electrochemical device according to claim 1 , wherein a porosity of said heat-resistant separator is 55% or higher.
5. The electrochemical device according to claim 2 , wherein a difference in melting points between said adhesive separator and said flexible film is up to 20° C.
6. The electrochemical device according to claim 2 , wherein a porosity of said heat-resistant separator is 55% or higher.
7. The electrochemical device according to claim 3 , wherein a porosity of said heat-resistant separator is 55% or higher.