Fuel cell extending longitudinally along a stacking axis and comprising alternating bipolar modules (Mb) and membrane-electrode assemblies so as to form a stack comprising at least one electrochemical cell, two end plates extending to the ends of the stack, each bipolar module (Mb) comprising at least one first main channel (Co) for the circulation of an oxidizing fluid, a second main channel (Cr) for the circulation of a reducing fluid and a third main channel (Cc) for the circulation of a heat-transfer fluid, the fuel cell comprising: - at least one heating module (Mc), mounted between the end plates, comprising at least one auxiliary channel (Ca) comprising a catalyst chemical element, the auxiliary channel (Ca) being configured to circulate a mixture of oxidizing fluid and reducing fluid so as to generate heat during the reaction of the oxidizing fluid, the reducing fluid and the catalyst chemical element in order to heat the fuel cell, - at least one bipolar module (Mb) being a heating module (Mc), referred to as a mixed module (Mm), the mixed module (Mm) comprising at least one first main channel (Co) for the circulation of the oxidizing fluid, a second main channel (Cr) for the circulation of the reducing fluid, a third main channel (Cc) for the circulation of the heat-transfer fluid and an auxiliary channel (Ca), comprising a catalyst chemical element, which is configured to circulate a mixture of oxidizing fluid and reducing fluid, - each mixed module (Mm) comprises a first bipolar plate and a second bipolar plate, each bipolar plate (8A, 8B) comprising at least one concave portion external to the mixed module (Mm) and one convex portion internal to the mixed module (Mm), the convex portion of the first bipolar plate being positioned opposite the convex portion of the second bipolar plate, the convex portions mounted opposite one another forming a circulation channel, the fuel cell being characterized in that each mixed module (Mm) comprises a spacer plate, mounted between the first bipolar plate and the second bipolar plate so as to form in the circulation channel, the third main channel (Cc) for the circulation of the heat-transfer fluid and the auxiliary channel (Ca). - at least one heating module (Mc), mounted between the end plates, comprising at least one auxiliary channel (Ca) comprising a catalyst chemical element, the auxiliary channel (Ca) being configured to circulate a mixture of oxidizing fluid and reducing fluid so as to generate heat during the reaction of the oxidizing fluid, the reducing fluid and the catalyst chemical element in order to heat the fuel cell, - at least one bipolar module (Mb) being a heating module (Mc), referred to as a mixed module (Mm), the mixed module (Mm) comprising at least one first main channel (Co) for the circulation of the oxidizing fluid, a second main channel (Cr) for the circulation of the reducing fluid, a third main channel (Cc) for the circulation of the heat-transfer fluid and an auxiliary channel (Ca), comprising a catalyst chemical element, which is configured to circulate a mixture of oxidizing fluid and reducing fluid, - each mixed module (Mm) comprises a first bipolar plate and a second bipolar plate, each bipolar plate (8A, 8B) comprising at least one concave portion external to the mixed module (Mm) and one convex portion internal to the mixed module (Mm), the convex portion of the first bipolar plate being positioned opposite the convex portion of the second bipolar plate, the convex portions mounted opposite one another forming a circulation channel, the fuel cell being characterized in that each mixed module (Mm) comprises a spacer plate, mounted between the first bipolar plate and the second bipolar plate so as to form in the circulation channel, the third main channel (Cc) for the circulation of the heat-transfer fluid and the auxiliary channel (Ca).