Thin battery and battery device
View Patent ↗Disclosed is a thin battery including an electrode assembly in sheet form and a housing for accommodating the electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and an electrolyte layer interposed therebetween. A lubricating material with a lubricating effect is interposed between an inner surface of the housing and the electrode assembly, and is, for example, an inert gas. The inert gas includes, for example, at least one of nitrogen and argon. It is preferable that the lubricating material is present, at least, between end surfaces of the electrode assembly on both sides in the thickness direction thereof and two main flat surfaces of the inner surface of the housing which face the end surfaces, respectively.
1. A thin battery comprising an electrode assembly in sheet form and a housing for accommodating the electrode assembly,
the electrode assembly including a positive electrode, a negative electrode, and an electrolyte layer interposed between the positive and negative electrodes, and
a lubricating material with a lubricating effect, being interposed between an inner surface of the housing and the electrode assembly,
wherein the thin battery has a thickness of 5 mm or less and is flexible,
the housing having an upper main surface and a lower main surface, and a plurality of side edge portions opposing outer side edges of the electrode assembly, the plurality of side edge portions surrounding the outer side edges of the electrode assembly when viewed in plan, said side edge portions of the housing being flexible, and
the lubricating material is present, at least, between entire end surfaces of the electrode assembly on both sides in a thickness direction thereof, and two main flat surfaces of the inner surface of the housing which face the end surfaces, respectively.
2. The thin battery in accordance with claim 1 , wherein the lubricating material is an inert gas.
3. The thin battery in accordance with claim 2 , wherein the inert gas includes at least one of nitrogen and argon.
4. The thin battery in accordance with claim 1 , wherein a ratio V/S of a volume V μL of the lubricating material filled in the housing, relative to a total area S cm 2 of the two main flat surfaces, is 0.5 μL/cm 2 or more and 7 μL/cm 2 or less.
5. The thin battery in accordance with claim 1 , wherein the electrolyte layer includes a dry polymer electrolyte or a gel polymer electrolyte.
6. The thin battery in accordance with claim 1 ,
wherein the negative electrode includes a negative electrode current collector sheet, and an active material layer adhering to one or both surfaces of the negative electrode current collector sheet,
the active material layer is a lithium metal layer or a lithium alloy layer, and
the negative electrode current collector sheet is an electrolytic copper foil, and a surface roughness of the electrolytic copper foil is 0.4 μm or more and 10 μm or less.
7. The thin battery in accordance with claim 1 , wherein the housing is formed from a laminate film, the laminate film including a water vapor barrier layer and a resin layer formed on one or both surfaces of the barrier layer, and the barrier layer being a metal layer or a ceramic layer.
8. The thin battery in accordance with claim 1 having a thickness of 1 mm or less.
9. A battery device comprising the thin battery in accordance with claim 1 and an electronic device which is driven by power supplied from the thin battery, the thin battery and the electronic device being integrated together to form a sheet.