| 摘要 |
PROBLEM TO BE SOLVED: To provide a power storage device which enables the suppression of gas penetration from the inside of a case into to a current interrupt part.SOLUTION: A secondary battery 10 comprises: a case in which an electrode assembly is enclosed; a conduction part (negative electrode welded part P) electrically connecting between a negative electrode terminal 16 provided on the case and a negative electrode conductive member 60 connected to the electrode assembly; and a current interrupt part 80 having a structure arranged so that the negative electrode welded part P is broken by deformation of a deformable plate 85 accompanying the rise in an inside pressure of the case. The inside pressure of the case acts on one face of the deformable plate 85, whereas a pressure different from the inside pressure of the case acts on the other face. The secondary battery 10 further comprises: a protection film 90 covering a superposing portion of the negative electrode terminal 16 and the current interrupt part 80. The protection film 90 has opening parts 91 and 92; the inner edge of each opening part is put in close contact with an opposed face of the covered part.SELECTED DRAWING: Figure 7 |
