This cooling module comprises a housing, which has an external support face comprising means for fastening power conversion modules on the external support face, and a heat transfer fluid network comprising branches extending in the housing in a network plane occupying an individual zone. Each branch comprises a supply collector, a discharge collector and several individual sub-branches. Each sub-branch is connected to the supply collector via an inlet end of the sub-branch in question, is connected to the discharge collector via an outlet end of the sub-branch in question, occupies an individual sub-zone comprised in the zone of the branch in question, and is deviated relative to the other sub-branches between the supply collector and the discharge collector. Each sub-branch forms a single channel that has an undulation with a regular pitch.