Traction battery system of a motor vehicle

A traction battery system for a motor vehicle, said traction battery system comprising:

• at least two battery modules which each comprise (i) a plurality of batteries, (ii) a module housing comprising a housing case and at least one housing cover, said housing defining an enclosed chamber in which the plurality of batteries are positioned, and (iii) a venting unit incorporated into the housing cover, the venting unit having a vent opening and a bursting element to enable a discharge of gas from the module housing via the vent opening,
• a first longitudinal support and a second longitudinal support between which the battery modules are disposed, and wherein the longitudinal supports each have a vent chamber which is configured to receive and pass the gas flowing via the venting unit, and
• an auxiliary channel fluidly interconnecting the vent opening of the venting unit with the vent chamber, wherein, in a burst state of the bursting element, the auxiliary channel forms a defined and direct passageway between the vent chamber of one of the longitudinal supports and the enclosed chamber of the housing,
• wherein, for each longitudinal support, a cooling chamber which extends beside the vent chamber is configured separately from said vent chamber for cooling the gas flowing in the longitudinal support,
• wherein the auxiliary channel is a separate tube element that is mounted to (i) an outlet port formed in the housing cover and (ii) an inlet port formed in said one of the longitudinal supports.