Battery unit
A battery unit includes a battery assembly. The battery assembly includes a glass ceramic and a positive-side active material constituting a first composite layer, a glass ceramic and a negative-side active material constituting a second composite layer, and a solid-state electrolyte layer located between the first composite layer and the second composite layer. The battery unit also includes a case in which the battery unit is stored, a load sensor provided on the case, and a clamp member clamping the case and the load sensor.
1. A battery unit comprising:
a solid-state battery including
a first composite layer having a glass ceramic containing fired sulfide glass and a positive-side active material encapsulated within said fired sulfide glass,
a second composite layer having a glass ceramic containing fired sulfide glass and a negative-side active material encapsulated within said fired sulfide glass,
a solid-state electrolyte layer located between said first composite layer and said second composite layer, and having a glass ceramic having fired sulfide without containing a positive-side active material and a negative-side active material;
a case storing said solid-state battery;
a load sensor provided on said case; and
a clamp member clamping said case and said load sensor.
said first composite layer, second composite layer and solid-state electrolyte layer formed together as a single unit by firing said layers stacked together at a temperature higher than or equal to a glass transition point of said sulfide glass such that said positive-side active material and said negative-side active material are encapsulated within said sulfide glass.
2. The battery unit according to claim 1 , wherein said load sensor is provided on an outer surface of said case, located at a region in a stacking direction of said first composite layer, said second composite layer, and said solid-state electrolyte layer.
3. The battery unit according to claim 1 , further comprising a control unit storing in advance output reference data obtained by measuring an output of said load sensor with respect to a state of charge of said battery unit,
wherein said control unit detects the state of charge of said solid-state battery based on an output from said load sensor and said output reference data.
4. The battery unit according to claim 3 , further comprising a temperature sensor that can measure a temperature of said solid-state battery, wherein
said control unit stores temperature load data in advance, obtained by measuring thermal load generated between said case and said load sensor by a temperature of said solid-state battery, and
said control unit detects the state of charge of said solid-state battery based on an output from said load sensor, an output from said temperature sensor, said output reference data, and said temperature load data.
5. The battery unit according to claim 3 , further comprising a voltage sensor that can measure a voltage of said solid-state battery, wherein
said control unit stores in advance charge voltage data, obtained by measuring an output of said voltage sensor when charging of said solid-state battery is completed, and charge load data obtained by measuring an output of said load sensor when charging is completed,
said control unit senses when charging of said solid-state battery is completed based on an output from said voltage sensor and said charge voltage data,
said control unit senses a degraded state of said solid-state battery based on an output of said load sensor when charging is completed, and said charge load data.