Patent ID: 9543563
Date: 2017-01-10
CPC Classifications: H01M,Y02E

Claim:
1. An electric storage device comprising: a casing; an electrode assembly accommodated within the casing, the electrode assembly including a positive electrode and a negative electrode; an electrode terminal provided on a terminal attachment wall of the casing; a first conductive member accommodated within the casing and electrically connected to the electrode assembly; a second conductive member accommodated within the casing and electrically connected to the electrode terminal; and a current interruption device accommodated within the casing, connected in series between the first conductive member and the second conductive member, and configured to connect or interrupt a conductive path from the electrode assembly to the electrode terminal, wherein the electrode assembly comprises a tab protruding from at least one of the positive electrode and the negative electrode toward the terminal attachment wall, the current interruption device includes a deformable plate electrically connected to the first conductive member and the second conductive member to constitute part of the conductive path, the deformable plate comprises a joint part that forms a joint with a joint receiving member to connect the conductive path, the deformable plate being configured to, when a pressure inside the casing rises, deform to be separated from the joint receiving member to interrupt the conductive path, the joint receiving member being either the first conductive member or the second conductive member, the first conductive member, the second conductive member, and the current interruption device are disposed between the terminal attachment wall and the electrode assembly, the first conductive member extends along the terminal attachment wall to connect the tab and the current interruption device, and the second conductive member is connected to the current interruption device at a location that is farther from the terminal attachment wall than a connection between the first conductive member and the current interruption device, and extends along the terminal attachment wall to connect the current interruption device and the electrode terminal.