Laminate battery with deformation restricting member

Abstract

An electrode terminalis connected to a current collector partof electrodes through a deformation restricting member. Between laminate filmsand, a spaceis formed above and below the current collector part. The deformation restricting memberis placed close to the inner wall peripheral portion of an outer package including sealing parts, thereby forming a deformation-restricting partto restrict the inward deformation of the laminated films. In a section extending from the inside end of the deformation restricting memberto a battery element, the laminated filmsface the spaceto allow the deformation of the laminated filmsin response to the change of internal pressure. At the decrease of internal pressure, the contraction of the laminated filmscan be localized in the deformation-allowing part, thereby reducing the bending stress on an end portion of the sealing parts. Thus, the laminate type secondary battery and the battery pack thereof can be provided with the effect that the concentration of stress on the bonded part of the laminated films can be suppressed even when the expansion and contraction of the laminated films are repeated in response to the change of internal pressure of the laminated films bonded to hermetically accommodate the battery element.