Patent ID: 10094884

Abstract:
This monitoring sensor is provided with polymer matrix layers 3 containing a magnetic filler and attached to an outer casing or an electrode group, and a magnetism detection unit 4 for detecting a change in magnetism. The magnetic filler is magnetized in the in-plane direction of the polymer matrix layers 3. An interface layer 5 is formed between the polymer matrix layers 3 that are arranged with edges thereof facing each other. The directions of magnetization of the magnetic filler on one side and the other side having the interface layer 5 interposed therebetween are opposite to each other and intersect with the interface layer 5 as viewed in the thickness direction of the polymer matrix layers 3. The magnetism detection unit 4 is disposed on a straight line L1 passing through the interface layer 5 and extending in the thickness direction of the polymer matrix layers 3.