| 摘要 |
PROBLEM TO BE SOLVED: To provide a vacuum thermally insulated container, which can be easily manufactured at low costs and provided with high vacuum retention reliability. SOLUTION: A hollow layer is arranged in a wall isolating a battery module 37 from the external space, porous thermally insulating boards 34a, 34b, 34c having cavities or pores communicated with the external air are arranged in the hollow layer, and the thermally insulating boards 34a, 34b, 34c and a vacuum layer formed when the hollow layer is set in a vacuum condition are used as thermally insulating means in a box type vacuum thermally insulated container 44. At least an upper face part in the walls is constructed of a flat plate type hollow container 49 forming a vacuum layer independent of other walls.
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