The invention is based on a battery system (b), in particular a lithium - ions - a battery system, comprising at least a first cable (k1) and at least a second cable (k2) for the production of an electrical contact, wherein a cable of an insulating material by an electrical conductor surrounded, and wherein the battery system has a device (a), which for the prevention of a fire propagation along the at least one first cable (k1) and of the at least one second cable (k2) and / or for preventing a danger of between the at least one first cable (k1) and the at least one second cables (k2) is suitable, and wherein the apparatus (a) is suitable, a spatial distance between the at least one first cable (k1) and the at least one second cables (k2) and to provide the apparatus (a) made of a flameproof material is carried out and / or that the at least one first cable (k1) and / or the at least one second cable (k2) at least one intermediate element (z), the intermediate element (z) for separating and joining at least two parts of the at least one first cable (k1) or of at least two parts of the at least one second cable (k2) is suitable, and the intermediate element (z) is designed to be made of a flameproof material.
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