The busbar unit includes a first busbar having a substrate section provided with first fusible portions, and a first plate section that extends from the substrate section; a second busbar having a substrate section provided with a second fusible portion, and a second plate section overlapped with the first plate section; and an insulating housing section that accommodates the plate sections in a state in which the plate sections are overlapped with each other. The first plate section is provided with a retainer that fixes the first and second plate sections so that the first and second plate sections are not displaced in either a direction in which the first and second plate sections approach each other, or a direction in which the first and second plate sections are overlapped with each other.
1. A busbar unit comprising:
a first busbar comprising:
a substrate section provided with a first fusible portion; and
a first plate section extending from the substrate section;
a second busbar comprising:
a substrate section provided with a second fusible portion; and
a second plate section overlapped with the first plate section; and
an insulating housing section configured to accommodate the first plate section and second plate section in a state in which the first plate section and second plate section are overlapped with each other,
wherein one of the first plate section and second plate section is integrally formed with a retainer configured to fix the first plate section and second plate section and configured to prevent the first plate section and second plate section from being displaced in a first direction in which the first plate section and second plate section are displaced close to each other and in a second direction corresponding to a thickness direction of the busbar unit,
wherein the retainer is coplanar with the first and the second busbars, and
wherein only the first and the second plate sections accommodated in the retainer are portions of the first and the second busbars being overlapped with each other.
2. The busbar unit according to claim 1 , wherein
the retainer is provided with a standing portion vertically arranged from an end portion of the one of first plate section and the second plate section in a perpendicular direction which is perpendicular to both the direction in which the first plate section and the second plate section come close to each other and the direction in which the first plate section is overlapped with the second plate section, and an overlapped plate which extended from the standing portion and is overlapped with the other of the first plate section and the second plate section.
3. The busbar unit according to claim 1 , wherein
a rib having a convex shape protrudes from a surface of the one of the first plate section and the second plate section, and the rib is provided at a position opposite to an end portion of the other of the first plate section and the second plate section in a state where the first plate section is overlapped with the second plate section, and
the end portion of the other of the first plate section and the second plate section is spaced apart from the substrate section of the other of the first plate section and the second plate section.
4. The busbar unit according to claim 3 , wherein the rib covers a gap between the first plate section and the second plate section.
5. The busbar unit according to claim 1 , wherein
the first busbar has a first thickness, and
the second busbar has a second thickness thinner than the first thickness.
6. The busbar unit according to claim 1 , wherein the retainer and the rib are configured to overlap each other.
7. The busbar unit according to claim 1 , wherein the other one of the first plate section and second plate section comprises a first end in the first direction attached to a corresponding substrate section and a second end opposite from the first end, and
wherein the second end of the other one of the first plate section and second plate section is configured to contact a rib in response to the first plate section and second plate section being overlapped.
8. The busbar unit according to claim 1 , wherein the first busbar is made of a material having conductivity higher than conductivity of the second bus bar.
9. The busbar unit according to claim 1 , wherein
at least one of the first plate section and the second plate section includes a rib having a convex shape and protruding from a surface of the one of the first plate section and the second plate section, and
the retainer and the rib are configured to overlap each other.