Accumulator

A rechargeable battery comprising:

• at least one cell for storing electrical energy and
• at least one heating device comprises a flexible multi-layer film with an electrically contacted heating resistance element formed as a metal film or a metalizes plastic film or a wire or a grid,
• wherein the heating device is a part of a cooling device,
• wherein the multi-layer film of the heating device at least partly forms a coolant channel,
• wherein the multi-layer film comprises a first plastic film, an enforcement layer connected to the first plastic film, and a metal film connected to the enforcement layer,
• wherein the first plastic film has a layer thickness of between 10 μm and 200 μm, the enforcement layer has a layer thickness of between 5 μm and 50 μm, and the metal film has a layer thickness between 5 μm and 200 μm;
• and
• wherein the multi-layer film further comprises at least a second plastic film and wherein the electrically contacted heating resistance element is arranged between the first and second plastic films.