TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Method: The first part of the bipolar plate is closed in the region of the sealing element. The first part of the bipolar plate is supported on the opposite side of the sealing element during the molding-process. At least one connection line and at least one sealing element are not intersected and/or are not adjoined. At least one sealing element is produced, which surrounds a medium-passage opening in the bipolar plate. A sealing element is contacted with a carrier element of an electro-chemically active cell. At least one insulating element is produced, through which the bipolar plate is electrically insulated with respect to another element of the electrochemical device, in the mounted state of the electrochemical device. A gap sealing element is formed on an inner side of a sealing element facing away from a portion of the bipolar plate. The first part of the bipolar plate and the second part of the bipolar plate are bonded together by a material bond or by a form fit. At least one additional sealing element is formed on the second part of the bipolar plate. The first part of the bipolar plate and the second part of the bipolar plate are interconnected after the generation of the sealing element, by a material fit, or by welding, soldering or adhesive bonding. The minimum distance between the connecting line and the sealing element is less than or equal to 2 mm. The bipolar plate comprises at least one sealing element surrounding a medium passage opening and at least one interruption by which a fluid passing through the sealing element can move in a flow field of the bipolar plate. At least one connecting passage is formed between the first part and the second part of the bipolar plate, through which a fluid can pass in a flow field of the bipolar plate.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: At least one sealing element comprises a liquid silicone rubber, and is made of a rubber or a thermoplastic elastomer. EXAMPLE - No suitable example given.