Capacitor mounting structure and power conversion apparatus

Abstract

A capacitor mounting structure 1 comprises: a mounting substrate 10 that has a first main surface 10a and a second main surface 10b which oppose each other in the thickness direction; and a capacitor 20 that is disposed on the first main surface 10a of the mounting substrate 10. The capacitor 20 includes: a capacitor element 30 that has a first external electrode 31 and a second external electrode 32 on a surface of an element body 33; an exterior film 40 that accommodates the capacitor element 30 inside; and a first lead-out terminal 51 and a second lead-out terminal 52 that are electrically connected to the first external electrode 31 and the second external electrode 32, respectively, and that extend to the outside of the exterior film 40. The exterior film 40 includes a first film material 41 that covers one portion of the capacitor element 30, and a second film material 42 that covers the remaining portion of the capacitor element 30. A flange part 45 to which an outer edge of the first film material 41 and an outer edge of the second film material 42 are joined is provided on an outer edge of the exterior film 40. The first lead-out terminal 51 and the second lead-out terminal 52 are led out from between portions of the flange part 45 to the outside of the exterior film 40. At least one groove 15 is provided on the first main surface 10a of the mounting substrate 10. A portion of the flange part 45 including the first lead-out terminal 51 and the second lead-out terminal 52 is inserted into the groove part 15. The first lead-out terminal 51 and the second lead-out terminal 52 protrude from the second main surface 10b of the mounting substrate 10.