SEALED SECONDARY BATTERY

摘要

There is provided a sealed secondary battery whose current-blocking system yields little change in the actuation pressure even on long-term use. The sealed secondary battery comprises a current-blocking system 80 that is actuated by a pressure rise inside a battery case 12 to disconnect conduction path between an electrode and an electrode terminal. Current-blocking system 80 comprises a pressure-sensitive member having a pressure-sensitive deformable portion 32 that deforms from a first state via snap-through deformation to a second state upon a pressure rise inside battery case 12, and is configured to disconnect the conduction path by snap-through deformation of pressure-sensitive deformable portion 30.

主权项

1. A sealed secondary battery comprising
a positive electrode, a negative electrode, a battery case housing the positive electrode and the negative electrode, an electrode terminal electrically connected to either the positive electrode or negative electrode and exposed outside the battery case, and a current-blocking system that is actuated by a pressure rise inside the battery case to disconnect conduction path between the electrode and the electrode terminal, wherein the current-blocking system comprises a pressure-sensitive member having a pressure-sensitive deformable portion in a plate form, which deforms from a first state via snap-through deformation to a second state upon a pressure rise inside the battery case; and is configured to disconnect the conduction path by snap-through deformation of the pressure-sensitive deformable portion.