| 摘要 |
The purpose of the present invention is to reduce, without increasing the number of components and without causing battery capacity degradation, the internal stress acting on an electrode due to the expansion and contraction of an electrode active material of a lithium-ion secondary battery and to provide a winding-type lithium-ion secondary battery having less battery performance degradation. The lithium-ion secondary battery (C1) of the present invention has an electrode group (100) formed by winding an electrode plate, a battery can (101) in which the electrode group (100) is housed, and an electrolyte injected into the battery can (101) and is characterized by having a holding means (102) attached to an outer circumference surface of the electrode group (100) to maintain the winding state of the electrode group (100) and deform in accordance with expansion in the radial direction of the electrode group (100) to allow the expansion. |
