The invention relates to a transmitting device for transmitting electrical signals from at least one galvanic cell to at least one electronic evaluating unit, wherein the transmitting device has at least one cell connection element for electrically connecting at least a first galvanic cell to a second galvanic cell and has a flat cable arranged directly on the cell connection element, wherein the flat cable extends from the cell connection element to an electronic evaluating unit for evaluating the electrical signals. The invention further relates to a rechargeable energy storage unit at least for storing electrical energy, comprising at least two galvanic cells electrically connected to each other and a transmitting device, and to the use of at least one flat cable for transmitting electrical signals from at least one galvanic cell to at least one electronic evaluating unit.