Power electronics module system with built-in cooling system

The application relates to a power electronics module system (1) having a power electronics module (2) and a connection module (3), wherein the power electronics module has a first converter (4) and a cooling device (7), wherein the cooling device has a converter cooling region (6) and a receiving region (5), wherein the first converter is arranged in the converter cooling region, and the receiving region has side walls (11a, 11b, 11c, 11d), one of said side walls (11d) separating the receiving region from the converter cooling region, wherein the receiving region has electrically conductive first contact elements (9) that have a thermally conductive connection to a side wall (11c) of the receiving region, and the connection module has electrically conductive second contact elements (10) arranged on the connection module such that an electrically conductive contact between the first and the second contact elements (9, 10) is established when the connection module is arranged in the receiving region, wherein a cooling channel, through which a fluid cooling medium can flow, runs inside at least one of the side walls of the receiving region and continues to run through the converter cooling region. The invention provides a power module system that permits efficient cooling of a converter in a power module, and the use of a unified power module.