Sensor including a polymer matrix for monitoring sealed secondary battery, sealed secondary battery including the monitoring sensor, and method for monitoring sealed secondary battery

A monitoring sensor for monitoring a sealed secondary battery in which an electrode group is accommodated in an inside of a sealed outer casing,

• the monitoring sensor comprising:
• a polymer matrix layer containing a magnetic filler and attached to the outer casing or the electrode group, and
• a magnetism detection unit for detecting a change in magnetism accompanying a deformation of the polymer matrix layer, wherein
• the magnetic filler is magnetized in a thickness direction of the polymer matrix layer, and
• the magnetism detection unit is disposed on a straight line passing through an edge of the polymer matrix layer and extending in the thickness direction of the polymer matrix layer.

A monitoring sensor for monitoring a sealed secondary battery in which an electrode group is accommodated in an inside of a sealed outer casing,

• the monitoring sensor comprising:
• polymer matrix layers containing a magnetic filler and attached to the outer casing or the electrode group, and
• a magnetism detection unit for detecting a change in magnetism accompanying a deformation of the polymer matrix layers, wherein
• the magnetic filler is magnetized in a thickness direction of the polymer matrix layers,
• a gap is disposed between the polymer matrix layers that are arranged with edges thereof facing each other,
• directions of magnetization of the magnetic filler on one side and the other side having the gap interposed therebetween are the same as each other, and
• the magnetism detection unit is disposed on a straight line passing through the gap and extending in the thickness direction of the polymer matrix layers.