A method for operating a storage device for storing electrical energy, with at least one storage cell, which comprises a cell housing, a receiving chamber delimited by the cell housing and at least one storage element accommodated in the receiving chamber for storing electrical energy, and with a safety device, the method comprising:
- determining a critical variation of a condition of the storage cell;
- and
- activating safety devices sequentially during the critical variation of the condition of the storage cell, wherein
- a separating device as a first safety device separates at least the storage cell from a circuit of the storage device,
- a short-circuit device as a second safety device causes a short circuit at least of the storage cell, and
- a degassing device as a third safety device degasses the receiving chamber.