Switching device for an electrochemical energy storage, electrochemical energy storage and energy storage system

The invention relates to a switching device (15) for an electrochemical energy storage device (10), comprising: a film transistor means (20) having at least an organic transistor (21, 22) and which is surface mountable on at least one electrode of the electrochemical energy storage device and which of an external power source (30) is controllable and is designed as a controllable electrical resistance in series with an internal resistance of the electrochemical energy storage device.