Film packaged battery
A film package battery 1 has a battery element ( 20 ) having a positive electrode, a negative electrode and a separator that are stacked or wound, wherein, at least at 200° C., the separator does not melt or soften and has a heat shrinkage ratio of 3% or less; a film package ( 10 ) enclosing the battery element; and a fixing tape ( 70 ) fixed to a part of the battery element and fixed to an inner surface of the film package.
1. A film package battery comprising:
a battery element having a positive electrode, a negative electrode and a separator, the positive electrode, the negative electrode, and the separator being stacked or wound, wherein, at least at 200° C., the separator does not melt or soften and has a heat shrinkage ratio of 3% or less;
a film package enclosing the battery element; and
a fixing tape fixed to a part of the battery element and fixed to an inner surface of the film package, wherein the fixing tape has a multilayer structure comprising a fusion bondable layer, and a heat resistant layer having a melting point higher than a melting point of the fusion bondable layer by 10° C. or more.
2. The film package battery according to claim 1 , wherein the fixing tape and the inner surface of the film package are fixed by fusion bonding.
3. The film package battery according to claim 1 , wherein the separator is formed of at least one of a polyimide resin, a polyamide resin, and a polyphenylene sulfone resin.
4. The film package battery according to claim 1 , wherein the fixing tape comprises, as the fusion bondable layer,
a first fusion bondable layer fixed to the inner surface of the film package, and
a second fusion bondable layer fixed to the battery element.
5. The film package battery according to claim 1 , wherein the melting point of the fusion bondable layer is lower than a melting point of the separator.
6. The film package battery according to claim 1 , wherein the fixing tape further comprises
a pressure-sensitive adhesive layer for attaching the fixing tape to the battery element before fusion bonding.
7. A film package battery comprising:
a battery element having a positive electrode, a negative electrode and a separator, the positive electrode, the negative electrode, and the separator being stacked or wound, wherein, at least at 200° C., the separator does not melt or soften and has a heat shrinkage ratio of 3% or less;
a film package enclosing the battery element; and
a fixing tape fixed to a part of the battery element and fixed to an inner surface of the film package, wherein the fixing tape has a multilayer structure comprising a composite layer, and the composite layer is obtained by impregnating a fiber with a fusion bondable layer, the fiber having a melting point higher than a melting point of the fusion bondable layer by 10° C. or more.
8. The film package battery according to claim 7 , wherein the fixing tape and the inner surface of the film package are fixed by fusion bonding.
9. The film package battery according to claim 7 , wherein the separator is formed of at least one of a polyimide resin, a polyamide resin, and a polyphenylene sulfone resin.
10. The film package battery according to claim 7 , wherein the melting point of the fusion bondable layer is lower than a melting point of the separator.
11. The film package battery according to claim 7 , wherein the fixing tape further comprises a pressure-sensitive adhesive layer for attaching the fixing tape to the battery element before fusion bonding.