Ceramic container and battery and electric double layer capacitor using the same
A ceramic container includes a ceramic base having a hollow or open portion for accommodating a battery element or an electric double layer capacitor element, defined by a bottom portion and a side wall which surrounds a bottom surface of the bottom portion which bottom face faces the hollow or open portion, a ceramic coating layer formed on a periphery of the bottom face along an inner face of the side wall, a first metallized layer extending, on the bottom face, from a portion provided immediately under the side wall to an inside of an inner end of the ceramic coating layer via a portion provided immediately under the ceramic coating layer, and a conductive layer formed on the bottom face in order to cover an extended portion of the first metallized layer and the ceramic coating layer.
1. A ceramic container comprising:
a ceramic base having a hollow or open portion for accommodating a battery element or an electric double layer capacitor element, defined by a bottom portion and a side wall which surrounds a bottom face of the bottom portion, the bottom face facing the hollow or open portion;
a ceramic coating layer formed on a periphery of the bottom face along an inner face of the side wall;
a metallized layer extending, on the bottom face, from a portion provided under the side wall to an inside of an inner end of the ceramic coating layer via a portion provided under the ceramic coating layer; and
a conductive layer formed on the bottom face in order to cover an extended portion of the metallized layer and the ceramic coating layer.
2. The ceramic container of claim 1 , wherein the ceramic coating layer is formed over a whole periphery of the extended portion from an outer peripheral portion of an upper surface of the extended portion to the bottom face in addition to the ceramic coating layer provided immediately under the side wall.
3. The ceramic container of claim 1 , wherein the ceramic coating layer is formed of sintered alumina and has a thickness of 3 μm or more.
4. The ceramic container of claim 1 , wherein the ceramic coating layer is composed of a plurality of layers.
5. The ceramic container of claim 1 , wherein the conductive layer is formed of at least one metal selected from aluminum, zinc or an alloy containing these metals as main components, gold, stainless steel and titanium.
6. The ceramic container of claim 1 , wherein the conductive layer is composed of an aluminum layer and a titanium layer laminated on the aluminum layer.
7. The ceramic container of claim 1 , wherein the conductive layer is composed of a titanium layer and an aluminum layer laminated on the titanium layer.
8. The ceramic container of claim 1 , wherein the conductive layer is composed of layers obtained by sequentially laminating an aluminum layer and a titanium layer on another titanium layer.
9. A battery comprising:
the ceramic container of claim 1 ;
a positive electrode;
a negative electrode;
a separator provided between the positive and negative electrodes;
an electrolyte; and
a lid attached to an upper surface of the side wall in order to close the hollow or open portion,
the positive electrode, the negative electrode, the separator and the electrolyte being accommodated in the hollow or open portion.
10. An electric double layer capacitor comprising:
the ceramic container of claim 1 ;
two polarizable electrodes;
a separator provided between the two polarizable electrodes;
an electrolyte; and
a lid attached to an upper surface of the side wall in order to close the hollow or open portion,
the two polarizable electrodes, separator and electrolyte being accommodated in the hollow or open portion.