Crush type pressure detecting device, rechargeable battery with pressure detecting device, and portable electronic device

Abstract

A crush type pressure detecting device less in occurrence of malfunction, simple in structure, and inexpensive to manufacture is presented. On a crush plate made of ceramics or the like, a conductor path is formed, for example, in linear or U-shape, and electrodes are provided at both ends. Both ends of the crush plate are inserted into a holder made of plastic or printed board so as to support at both sides. An opening is provided in the holder to expose the electrode , thereby obtaining a crush type pressure detecting device of the invention. Terminal plates are connected to the electrodes of this detecting device , and the terminal plates are used as mounting members, and are disposed in contact with the object to be detected, for example, the outer wall of a housing of a rechargeable battery . One terminal plate is connected to the current collector in the housing , and other terminal plate is left over outside the housing as an output electrode , and the rechargeable battery having the crush type pressure detecting device according to the invention is obtained.