ELECTRICAL ENERGY STORAGE DEVICE

摘要

A current interruption device includes a first conductive member, a second conductive member, a first deformable member, a second deformable member, and a first seal member. The second conductive member is disposed at a position opposed to the first conductive member. A center portion of the first deformable member is fixed to the second conductive member. The second deformable member is disposed on a side opposite to the first deformable member relative to the second conductive member. The first seal member is disposed between the first conductive member and the second conductive member. A second seal member is disposed between the first conductive member and the casing. A gas permeability between the casing and the first conductive member is equal to or less than a gas permeability between the first conductive member and the second conductive member.

主权项

1. An electrical energy storage device comprising a current interruption device configured to interrupt conduction between an electrode and an electrode terminal when pressure in a casing exceeds a predetermined value, wherein
the electrode is accommodated in the casing, and the electrode terminal is fixed to the casing and configured to transfer electricity with the electrode, wherein the current interruption device comprises: a first conductive member fixed to the casing and connected to the electrode terminal; a second conductive member disposed at a position spaced from and opposed to the first conductive member, and connected to the electrode; a first deformable member disposed between the first conductive member and the second conductive member, an end of the first deformable member being connected to the first conductive member, a center portion of the first deformable member being connected to the second conductive member, and the first deformable member being configured to be brought out of conduction with the second conductive member when the pressure in the casing exceeds the predetermined value; a second deformable member disposed on a side opposite to the first deformable member relative to the second conductive member, and being provided with a projection, on a second conductive member side, that has a shape projecting toward the second conductive member; and a first seal member disposed between the first conductive member and the second conductive member and keeping an inside of the current interruption device airtight against an outside of the current interruption device, wherein a second seal member keeping an inside of the casing airtight against an outside of the casing is disposed between the casing and the first conductive member, and a gas permeability between the casing and the first conductive member which is where the second seal member seals is equal to or less than a gas permeability between the first conductive member and the second conductive member which is where the first seal member seals.