Battery system and battery safety alarm system

A battery system comprising:

• a lithium ion battery formed in a cylindrical shape and including an organic electrolytic solution as an electrolyte;
• a laser beam source that emits a laser beam;
• an optical fiber of a single mode that is wound around an outer circumferential portion of the lithium ion battery in a plurality of lines and via which the laser beam emitted from the light source is transmitted, the optical fiber including a core, a clad that covers an outer side of the core, and a covering layer that covers an outer side of the clad, wherein the core is formed of a material having a refractive index higher than that of the clad;
• a detector that receives the laser beam transmitted via the optical fiber and detects abnormality of the lithium ion battery on the basis of a change with time of an amount of received light;
• and
• an alarm that warns, when abnormality of the lithium ion battery is detected by the detector, a user of the abnormality,
• wherein the covering layer has a two-layer structure including a primary covering layer that covers the outer side of the clad and a secondary covering layer that further covers an outer side of the primary covering layer, wherein the primary covering layer is effective to disperse external force and is formed of a resin having an elastic modulus smaller than that of the secondary covering layer.

A battery system comprising:

• a battery;
• a light source that emits light;
• an optical fiber of a single mode that is wound around an outer surface portion of the battery and via which the light emitted from the light source is transmitted, the optical fiber including a core, a clad that covers an outer side of the core, and a covering layer that covers an outer side of the clad, wherein the core is formed of a material having a refractive index higher than that of the clad;
• and
• a detector that receives the light transmitted via the optical fiber and detects abnormality of the battery on the basis of a change in transmission properties caused by lateral pressure acting on the optical fiber,
• wherein the covering layer has a two-layer structure including a primary covering layer that covers the outer side of the clad and a secondary covering layer that further covers an outer side of the primary covering layer, wherein the primary covering layer is effective to disperse external force and is formed of a resin having an elastic modulus smaller than that of the secondary covering layer.

A battery system comprising:

• a battery;
• a light source that emits light;
• an optical fiber of a single mode that is wound around an outer surface portion of the battery and via which the light emitted from the light source is transmitted, the optical fiber including a core, a clad that covers an outer side of the core, and a covering layer that covers an outer side of the clad, wherein the core is formed of a material having a refractive index higher than that of the clad;
• and
• a detector that receives the light transmitted via the optical fiber and detects abnormality of the battery on the basis of a change with time of an amount of received light,
• wherein the covering layer has a two-layer structure including a primary covering layer that covers the outer side of the clad and a secondary covering layer that further covers an outer side of the primary covering layer, wherein the primary covering layer is effective to disperse external force and is formed of a resin having an elastic modulus smaller than that of the secondary covering layer.

A battery safety alarm system comprising:

• a light source that emits light;
• an optical fiber of a single mode that is wound around an outer surface portion of a battery and via which the light emitted from the light source is transmitted, the optical fiber including a core, a clad that covers an outer side of the core, and a covering layer that covers an outer side of the clad, wherein the core is formed of a material having a refractive index higher than that of the clad;
• and
• a detector alarm that receives the light transmitted via the optical fiber, detects abnormality of the battery on the basis of a change in transmission properties caused by lateral pressure acting on the optical fiber, and warns, when abnormality of the battery is detected, a user of the abnormality,
• wherein the covering layer has a two-layer structure including a primary covering layer that covers the outer side of the clad and a secondary covering layer that further covers an outer side of the primary covering layer, wherein the primary covering layer is effective to disperse external force and is formed of a resin having an elastic modulus smaller than that of the secondary covering layer.

A battery safety alarm system comprising:

• a light source that emits light;
• an optical fiber of a single mode that is wound around an outer surface portion of a battery and via which the light emitted from the light source is transmitted, the optical fiber including a core, a clad that covers an outer side of the core, and a covering layer that covers an outer side of the clad, wherein the core is formed of a material having a refractive index higher than that of the clad;
• and
• a detector alarm that receives the light transmitted via the optical fiber, detects abnormality of the battery on the basis of a change with time of an amount of received light, and warns, when abnormality of the battery is detected, a user of the abnormality,
• wherein the covering layer has a two-layer structure including a primary covering layer that covers the outer side of the clad and a secondary covering layer that further covers an outer side of the primary covering layer, wherein the primary covering layer is effective to disperse external force and is formed of a resin having an elastic modulus smaller than that of the secondary covering layer.