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The present invention relates to a battery using a case of which the section of the lower part containing an electric element is square or hexagonal and the section of the upper part containing a sealing plate is circular or elliptic. By virtue of the shape of the lower part the space efficiency of

The present invention relates to a battery using a case of which the section of the lower part containing an electric element is square or hexagonal and the section of the upper part containing a sealing plate is circular or elliptic. By virtue of the shape of the lower part the space efficiency of the battery pack is enhanced and by virtue of the shape of the upper part the productivity of the battery is improved. Further, preferably, the corners of the lower part of the case are rounded or chamferred, whereby the temperature rise in the battery pack is suppressed.

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1. A battery comprising an electric element, a case having an opening and a sealing plate, the opening being sealed with the sealing plate, wherein the case comprises a lower part comprising the electric element and an upper part comprising the sealing plate, a section of the lower part being square

1. A battery comprising an electric element, a case having an opening and a sealing plate, the opening being sealed with the sealing plate, wherein the case comprises a lower part comprising the electric element and an upper part comprising the sealing plate, a section of the lower part being square and the corner being chamferred or the corner forms a part of a circle, and a radius R of the circle and a radius r of a circle inscribed in the square are in a relation of 0.2<R/r<1.0 or a section of lower part being hexagonal and corners thereof are rounded or chamferred, and a section of the upper part being circular or elliptic.2. The battery according to claim 1 wherein the electric element has a coiled structure, a folded structure or a layered structure each formed of a positive electrode, a negative electrode and a separator interposed therebetween.3. The battery according to claim 1 wherein the opening and the sealing plate are caulked to effect sealing.4. A battery pack comprising the batteries according to any one of the claims 1-3 electrically connected in series or in parallel.5. A battery pack comprising the batteries of any one of the claims 1-3 electrically connected in series or in parallel, wherein at least one member selected from the group consisting of heat-collecting members, heat-releasing members, heat transfer members, safety members and electric members is placed in a space formed by a inside surface of the battery pack and the corners of the batteries or a space formed by the corners of adjacent batteries.6. The battery pack according to claim 5 wherein the heat-collecting member is made of at least one material selected from the group consisting of aluminum, copper and heat conductive polymers.7. The battery pack according to claim 5 wherein the heat-releasing member has a heat sink.8. The battery pack according to claim 5 wherein the heat transfer member has a heat pipe.9. A process for producing a battery which comprises:forming an electric element by interposing a separator between a positive electrode and a negative electrode, housing the electric element in a case having an opening wherein a section of the lower part being square and the corner being chamferred or the corner forms a part of a circle, and a radius R of the circle and a radius r of a circle inscribed in the square are in a relation of 0.2<R/r<1.0 or a section of lower part being hexagonal and corners thereof are rounded or chamferred, and a section of a upper part is circular or elliptic, placing a circular or elliptic sealing plate on the opening of the case, and caulking the case with the sealing plate to effect sealing. 10. A process for producing a battery which comprises:forming an electric element by interposing a separator between a positive electrode and a negative electrode, housing the electric element in a case having an opening wherein a section being square and the corner being chamferred or the corner forms a part of a circle, and a radius R of the circle and a radius r of a circle inscribed in the square are in a relation of 0.2<R/r<1.0 or a section being hexagonal and corners thereof are rounded or chamferred, subjecting the opening to a metal forming processing to form a section of the opening into a circular shape or elliptic shape, placing a circular or elliptic sealing plate on the opening of the case, and caulking the case with the sealing plate to effect sealing. 11. The process according to claim 10 wherein the metal forming processing is a roll-processing, a roll-swaging processing or a pressure forming processing.12. The process according to claim 9 or 10 wherein the electric element is formed in a coiled structure, a folded structure or a layered structure.13. A process for producing a battery case having a section of a lower part being square and the corner being chamferred or the corner forms a part of a circle, and a radius R of the circle and a radius r of a circle inscribed in the square are in a relation of 0.2<R/r<1.0 or a section of lower part being hexagonal and corners thereof are rounded or chamferred, and a section of an upper part is circular or elliptic, which process comprises a step of subjecting an opening of a case of which a section is square or hexagonal to a metal forming processing to form a section of the opening into a circular shape or elliptic shape.14. The process according to claim 13 wherein the metal forming processing is a roll-processing, a roll-swaging processing or a pressure forming processing.