Miniature battery with constant electrode pressure and electrolyte reservoir

An electrochemical voltage source, comprising:

• an anode containing lithium and having an end face;
• a cathode containing manganese oxide and having an end face, said end face of said anode facing towards said end face of said cathode;
• a housing, said cathode and said anode disposed in an interior of said housing, surrounded by said housing and disposed opposite one another;
• an electrolyte;
• an electrolyte reservoir in a form of a compressible storage body and receiving said electrolyte at least in part in said compressible storage body, said compressible storage body disposed between said anode and said cathode, said compressible storage body having a first side resting against said end face of said cathode and a second side, which faces away from said first side, and resting against said end face of said anode, said compressible storage body having an electrically insulating material;
• said cathode configured to experience an increase in volume when the electrochemical voltage source is discharged;
• and
• said anode configured to experience a decrease in volume during the discharge, wherein, at any time during the discharge, an absolute value of a volume increase of said cathode that has occurred up to that point is at least as great as an absolute value of a volume decrease of said anode that has occurred up to that point.