A plug-and-socket connector has a plastic housing that holds electrical male or female contacts in boreholes next to each other, and whose forward end forms a plug extension or as a socket extension and whose rear end receives and locks the male or female contacts in the housing. The connector includes two isolated conductors disposed along the length of the connector body and a plurality of pins connected to the respective conductors and extending away from the body. The mutual arrangement of these blocks within the isolating region, their type of conductivity and their concentration of dopants form at least one electronic module. The thermal energy storage apparatus also has an outer manifold area having at least one outer feed port and fluidically coupled to the inner manifold area.