Energy store system and state detection system including the energy store system

A state detection system, comprising:

• an energy store system, including:
• at least one cell element situated in a cell region, having an anode, a cathode and an electrolyte system, situated between the anode and the cathode, that is at least partially liquid, wherein the anode and the cathode each have a light transmitting region, the light transmitting region of the anode being aligned with the light transmitting region of the cathode;
• wherein at least one of the anode, the cathode and the electrolyte system are configured so that, as a function of at least one of a charging process and a discharging process of the cell element, functional material is situated in the electrolyte system, and the functional material situated in the electrolyte system is ascertainable at least one of qualitatively and quantitatively;
• a light source by which the electrolyte system is at least partially irradiated through the aligned light transmitting regions of the anode and the cathode;
• and
• a detector by which the absorption of the irradiated electrolyte system is analyzable via light from the light source, wherein the anode and the cathode are situated between the light source and the detector;
• and
• an evaluation unit.