Protective element
This protective element includes a fuse element having a first end portion and a second end portion, in which current flows from the first end portion toward the second end portion, a protruding member and a recessed member that are positioned opposing one another so as to sandwich a cutoff portion, and a pressing device that imparts an elastic force that shortens the relative distance in a first direction that represents the direction in which the protruding member and the recessed member sandwich the cutoff portion, wherein at least one pair of opposing surfaces of a protruding portion of the protruding member and a recessed portion of the recessed member that intersect the direction of current flow through the fuse element are positioned close to one another when viewed in a plan view from the first direction, and the fuse element is cut at a temperature equal to or higher than the softening temperature of the material that constitutes the fuse element.
1. A protective element comprising:
a fuse element having a first end portion and a second end portion, in which current flows from the first end portion toward the second end portion,
a protruding member and a recessed member that are positioned opposing one another so as to sandwich a cutoff portion of the fuse element positioned between the first end portion and the second end portion, and
a pressing device that imparts an elastic force that shortens a relative distance in a first direction that represents a direction in which the protruding member and the recessed member sandwich the cutoff portion, wherein
at least one pair of opposing surfaces of a protruding portion of the protruding member and a recessed portion of the recessed member that intersect a direction of current flow through the fuse element are positioned close to one another when viewed in a plan view from the first direction, and
the fuse element is cut at a temperature equal to or higher than a softening temperature of a material that constitutes the fuse element.
2. The protective element according to claim 1 , wherein the fuse element is formed from one or a plurality of plate-like or wire-like parts.
3. The protective element according to claim 1 , wherein a first terminal member is connected to the first end portion, and a second terminal member is connected to the second end portion.
4. The protective element according to claim 1 ,
further having a first electrode and a second electrode, wherein
the first electrode is connected to the first end portion of the fuse element and the second electrode is connected to the second end portion of the fuse element.
5. The protective element according to claim 1 , wherein the pressing device is a spring or a rubber.
6. The protective element according to claim 1 , wherein the recessed member is provided with a guide that guides the protruding portion into the recessed portion.
7. The protective element according to claim 1 , further comprising a heating element, in a position near the protruding portion, that contacts the fuse element and heats the fuse element.
8. The protective element according to claim 7 , wherein
the heating element comprises a heat-generating body, and further comprises an electrode layer electrically connected to the heat-generating body on a surface of the heating element on a fuse element side.
9. The protective element according to claim 8 ,
further having a third electrode, wherein
one end of the heat-generating body is connected electrically to the electrode layer, and another end of the heat-generating body is connected electrically to the third electrode.
10. The protective element according to claim 8 , wherein the heat-generating body is positioned on the fuse element on a side of the protruding member.
11. The protective element according to claim 8 , wherein the heat-generating body is positioned on the fuse element on a side of the recessed member.
12. The protective element according to claim 7 , wherein side surfaces of the heating element, outside surfaces of the protruding portion, and inside surfaces of the recessed portion are electrically insulated.
13. The protective element according to claim 1 , wherein the fuse element is a laminated body having an inner layer composed of a low-melting point metal and an outer layer composed of a high-melting point metal.
14. The protective element according to claim 13 , wherein the low-melting point metal is composed of Sn or a metal containing Sn as a main component, and the high-melting point metal is composed of Ag or Cu, or a metal containing Ag or Cu as a main component.
15. The protective element according to claim 1 , wherein in a state where a current exceeding a rated current flows through the fuse element, or state where a current is passed through the heat-generating body, the fuse element is heated to a temperature equal to or higher than the softening temperature, and the fuse element is cut, thereby cutting off current flow.
16. The protective element according to claim 1 , further comprising a support member, which is positioned inside the recessed portion of the recessed member, supports the fuse element from beneath either directly or indirectly, and is formed from a material that suppresses deformation of the fuse element at temperatures no higher than a temperature during rated current flow through the fuse element, but deforms under a force of the pressing device and allows cutting of the fuse element at temperatures equal to or higher than a solidus temperature of a material that constitutes the fuse element.
17. A protective element comprising:
a fuse element having a first end portion and a second end portion, in which current flows from the first end portion toward the second end portion,
a protruding member and a recessed member that are positioned opposing one another so as to sandwich a cutoff portion of the fuse element positioned between the first end portion and the second end portion, and
a pressing device that imparts an elastic force that shortens a relative distance in a first direction that represents a direction in which the protruding member and the recessed member sandwich the cutoff portion, wherein
at least one pair of opposing surfaces of a protruding portion of the protruding member and a recessed portion of the recessed member that intersect a direction of current flow through the fuse element are positioned close to one another when viewed in a plan view from the first direction,
a heating element that heats and melts the fuse element is provided in contact with the fuse element in a position near the protruding portion, and
the fuse element is cut by heating the heating element.
18. The protective element according to claim 17 , wherein the fuse element is formed from one or a plurality of plate-like or wire-like parts.
19. The protective element according to claim 17 ,
further having a first electrode and a second electrode, wherein
the first electrode is connected to the first end portion of the fuse element and the second electrode is connected to the second end portion of the fuse element.
20. The protective element according to claim 17 , wherein the pressing device is a spring or a rubber.
21. The protective element according to claim 17 , wherein the recessed member is provided with a guide that guides the protruding portion into the recessed portion.
22. The protective element according to claim 17 , wherein
the heating element comprises a heat-generating body, and further comprises an electrode layer electrically connected to the heat-generating body on a surface of the heating element on a fuse element side.
23. The protective element according to claim 22 ,
further having a third electrode, wherein
one end of the heat-generating body is connected electrically to the electrode layer, and another end of the heat-generating body is connected electrically to the third electrode.
24. The protective element according to claim 22 , wherein the heat-generating body is positioned on the fuse element on a side of the protruding member.
25. The protective element according to claim 22 , wherein the heat-generating body is positioned on the fuse element on a side of the recessed member.
26. The protective element according to claim 17 , wherein side surfaces of the heating element, outside surfaces of the protruding portion, and inside surfaces of the recessed portion are electrically insulated.
27. The protective element according to claim 17 , wherein the fuse element is a laminated body having an inner layer composed of a low-melting point metal and an outer layer composed of a high-melting point metal.
28. The protective element according to claim 27 , wherein the low-melting point metal is composed of Sn or a metal containing Sn as a main component, and the high-melting point metal is composed of Ag or Cu, or a metal containing Ag or Cu as a main component.
29. The protective element according to claim 17 , further comprising a support member, which is positioned inside the recessed portion of the recessed member, supports the fuse element from beneath either directly or indirectly, and is formed from a material that suppresses deformation of the fuse element at temperatures no higher than a temperature during rated current flow through the fuse element, but deforms under a force of the pressing device and allows cutting of the fuse element at temperatures equal to or higher than a solidus temperature of a metal material that constitutes the fuse element.
30. A protective element comprising:
a first electrode and a second electrode,
a fuse element connected by a solder at both end surfaces to the first electrode and the second electrode respectively,
a protruding member and a recessed member that are positioned opposing one another so as to sandwich the fuse element, and
a pressing device that imparts an elastic force that shortens a relative distance in a first direction that represents a direction in which the protruding member and the recessed member sandwich the fuse element, wherein
at least one pair of opposing surfaces of a protruding portion of the protruding member and a recessed portion of the recessed member that intersect a direction of current flow through the fuse element are positioned close to one another when viewed in a plan view from the first direction,
one end surface of the fuse element that is connected to either the first electrode or the second electrode is positioned inside an opening of the recessed portion when viewed in a plan view from the first direction, and
a connection between the one end surface and the first electrode or the second electrode is cut at a temperature equal to or higher than a softening temperature of a metal material that constitutes the solder.
31. A protective element comprising:
a first electrode and a second electrode,
a fuse element connected by a solder at both end surfaces to the first electrode and the second electrode respectively,
a protruding member and a recessed member that are positioned opposing one another so as to sandwich the fuse element, and
a pressing device that imparts an elastic force that shortens a relative distance in a first direction that represents a direction in which the protruding member and the recessed member sandwich the fuse element, wherein
at least one pair of opposing surfaces of a protruding portion of the protruding member and a recessed portion of the recessed member that intersect a direction of current flow through the fuse element are positioned close to one another when viewed in a plan view from the first direction,
one end surface of the fuse element that is connected to either the first electrode or the second electrode is positioned inside an opening of the recessed portion when viewed in a plan view from the first direction,
a heating element that heats and melts the fuse element is provided in contact with the fuse element in a position near the protruding portion, and
a connection between the one end surface and the first electrode or the second electrode is cut by heating the heating element.
32. A protective element comprising:
a first electrode and a second electrode,
a fuse element connected by a solder at both end surfaces to the first electrode and the second electrode respectively,
a protruding member and a recessed member that are positioned opposing one another so as to sandwich the fuse element, and
a pressing device that imparts an elastic force that shortens a relative distance in a first direction that represents a direction in which the protruding member and the recessed member sandwich the fuse element, wherein
at least one pair of opposing surfaces of a protruding portion of the protruding member and a recessed portion of the recessed member that intersect a direction of current flow through the fuse element are positioned close to one another when viewed in a plan view from the first direction,
both end surfaces of the fuse element that are connected to the first electrode and the second electrode are positioned inside an opening of the recessed portion when viewed in a plan view from the first direction, and
at least one connection between the end surfaces of the fuse element and the first electrode or the second electrode is cut at a temperature equal to or higher than a softening temperature of a metal material that constitutes the solder.
33. A protective element comprising:
a first electrode and a second electrode,
a fuse element connected by a solder at both end surfaces to the first electrode and the second electrode respectively,
a protruding member and a recessed member that are positioned opposing one another so as to sandwich the fuse element, and
a pressing device that imparts an elastic force that shortens a relative distance in a first direction that represents a direction in which the protruding member and the recessed member sandwich the fuse element, wherein
at least one pair of opposing surfaces of a protruding portion of the protruding member and a recessed portion of the recessed member that intersect a direction of current flow through the fuse element are positioned close to one another when viewed in a plan view from the first direction,
both end surfaces of the fuse element that are connected to the first electrode and the second electrode are positioned inside an opening of the recessed portion when viewed in a plan view from the first direction,
a heating element that heats and melts the fuse element is provided in contact with the fuse element in a position near the protruding portion, and
at least one connection between the end surfaces of the fuse element and the first electrode or the second electrode is cut by heating the heating element.