Coated cell and module battery
An outer peripheral surface of a cylindrical cell is coated with a heat insulation material. A heat-resistant material is stacked radially outside the heat insulation material. An electrical insulation material is stacked radially outside the heat-resistant material. The order in which the heat insulation material, the heat-resistant material and the electrical insulation material are stacked one on top of another may be changed. A coating material other than the heat insulation material, the heat-resistant material and the electrical insulation material may be provided.
1. A coated cell comprising:
a cylindrical cell of a sodium sulfur battery having an outer peripheral surface;
a first coating material coating said outer peripheral surface;
a second coating material stacked radially outside said first coating material and
a third coating material stacked radially outside said second coating material,
wherein said first coating material, said second coating material and said third coating material are a heat insulation material, a heat-resistant material and an electrical insulation material respectively,
said first coating material, said second coating material and said third coating material are a heat insulation material, an electrical insulation material and a heat-resistant material respectively,
said first coating material, said second coating material and said third coating material are a heat-resistant material, a heat insulation material and an electrical insulation material respectively,
said first coating material, said second coating material and said third coating material are a heat-resistant material, an electrical insulation material and a heat insulation material respectively,
said first coating material, said second coating material and said third coating material are an electrical insulation material, a heat insulation material, and a heat-resistant material respectively, or
said first coating material, said second coating material and said third coating material are an electrical insulation material, a heat-resistant material and a heat insulation material respectively, and
wherein said heat insulation material is a flexible mica sheet having a thickness in the range of 0.6 mm to 1.8 mm, said heat-resistant material is made of carbon or ceramics, and said electrical insulation material is made of mica.
2. The coated cell according to claim 1 , wherein
said heat-resistant material is a carbon sheet laminate comprised of not less than two carbon sheets stacked one on top of another.
3. The coated cell according to claim 1 , wherein said mica sheet has a thickness in the range of 1.0 mm to 1.4 mm.
4. The coated cell according to claim 1 , wherein:
said cylindrical cell includes
a positive electrode container,
a solid electrolyte tube housed in said positive electrode container,
an electric conduction assistant material housed in a gap between said positive electrode container and said solid electrolyte tube,
a positive electrode active material housed in said gap and impregnated into said electric conduction assistant material, and
a negative electrode active material isolated from said positive electrode active material by said solid electrolyte tube;
said cylindrical cell has a bottom surface; and
said heat-resistant material coats at least an area above an upper end of said electric conduction assistant material.
5. The coated cell according to claim 4 , wherein said electric conduction assistant material is graphite felt.
6. The coated cell according to claim 1 , wherein
said heat-resistant material is a carbon sheet laminate comprised of not less than two carbon sheets stacked one on top of another, and
each of said not less than two carbon sheets has a thickness in the range of 0.10 mm to 0.50 mm.
7. The coated cell according to claim 6 , wherein
each of said not less than two carbon sheets has a thickness in the range of 0.20 mm to 0.40 mm.
8. The coated cell according to claim 1 , wherein said cylindrical cell has a bottom surface, and
an upper end of a coating material that is one of said heat insulation material and said electrical insulation material which is radially outside said heat-resistant material is above an upper end of said heat-resistant material.
9. The coated cell according to claim 8 , wherein
an upper end of a coating material that is one of said heat insulation material and said electrical insulation material which is radially inside said heat-resistant material is above the upper end of said heat-resistant material.
10. The coated cell according to claim 1 , wherein
said cylindrical cell has a bottom surface, and
said electrical insulation material is a first electrical insulation material,
said coated cell further comprising
a second electrical insulation material coating said bottom surface,
wherein said third coating material includes
an outer peripheral surface-facing portion opposed to said outer peripheral surface, with said first coating material and said second coating material therebetween,
a bent portion, and
a bottom surface-facing portion contiguous to said outer peripheral surface-facing portion via said bent portion, said bottom surface-facing portion being opposed to said bottom surface, with said second electrical insulation material therebetween, said bottom surface-facing portion supporting said first coating material, said second coating material and said second electrical insulation material.
11. A module battery comprising:
a case having a housing space formed therein; and
not less than two coated cells housed in said housing space,
each of said not less than two coated cells comprising:
a cylindrical cell of a sodium sulfur battery having an outer peripheral surface;
a first coating material coating said outer peripheral surface;
a second coating material stacked radially outside said first coating material; and
a third coating material stacked radially outside said second coating material,
wherein said first coating material, said second coating material and said third coating material are a heat insulation material, a heat-resistant material and an electrical insulation material respectively,
said first coating material, said second coating material and said third coating material are a heat insulation material, an electrical insulation material and a heat resistant material respectively,
said first coating material, said second coating material and said third coating material are a heat-resistant material, a heat insulation material and an electrical insulation material respectively,
said first coating material, said second coating material and said third coating material are a heat-resistant material, an electrical insulation material and a heat insulation material respectively,
said first coating material, said second coating material and said third coating material are an electrical insulation material, a heat insulation material, and a heat-resistant material respectively, or
said first coating material, said second coating material and said third coating material are an electrical insulation material, a heat-resistant material and a heat insulation material respectively, and
wherein said heat insulation material is a flexible mica sheet having a thickness in the range of 0.6 mm to 1.8 mm, said heat-resistant material is made of carbon or ceramics, and said electrical insulation material is made of mica.
12. The module battery according to claim 11 , wherein
said not less than two coated cells are erected vertically and squarely arranged in a horizontal direction.