| 摘要 |
A secondary battery adapted to minimize deterioration attributable to temperature is provided. In the secondary battery, a cross-sectionally elliptic electricity-generating element group in which a positive electrode sheet including at one side in a longitudinal direction thereof a section not coated with an active material mixture, and a negative electrode sheet including at one side in a longitudinal direction thereof a section not coated with an active material mixture are wound via separators is accommodated in a battery container. When a planar region of the electricity-generating element group is seen in plan view, the number of connections between the non-coated section of the positive or negative electrode sheet and a connecting surface of a positive or negative electrode connecting sheet is two for each of positive and negative electrodes, and a distance between the two connections is greater than ¼ of innermost circumferential length of the electricity-generating element group, but is smaller than ¼ of outermost circumferential length of the electricity-generating element group. |
| 主权项 |
1. A secondary battery comprising:
a cross-sectionally elliptic electricity-generating element group in which a positive electrode sheet including at one side in a longitudinal direction thereof a section not coated with an active material mixture, and a negative electrode sheet including at one side in a longitudinal direction thereof a section non-coated with an active material mixture are wound via separators in such a form that the non-coated sections of the positive and negative electrode sheets are arranged on sides opposite to each other; a battery container to accommodate the electricity-generating element; a positive electrode connecting sheet and a negative electrode connecting sheet, both connected at one side of each thereof to the non-coated sections of the positive and negative electrode sheets, respectively, that are positioned at end portions of a planar region present between curves formed by winding the positive and negative electrode sheets of the electricity-generating element group; and a positive electrode external terminal and a negative electrode external terminal, both fixed to the battery container and each connected to the other side of each of the positive and negative electrode connecting sheets;wherein:
when the planar region of the electricity-generating element group is seen in plan view, the number of connections, between the non-coated section of the positive or negative electrode sheet and one side of the positive or negative electrode connecting sheet, is two for each of positive and negative electrodes; and a distance between the two connections is greater than ¼ of an innermost circumferential length of the wound positive and negative electrode sheets of the electricity-generating element group, but is smaller than ¼ of an outermost circumferential length of the wound positive and negative electrode sheets of the electricity-generating element group. |
