Resistor and method for making same
View Patent ↗A resistor includes a substantially cylindrical resistive element having a resistance of less than about 1 mΩ, a substantially cylindrical first termination electrically connected to the resistive element and a second termination electrically connected to the resistive element. The substantially cylindrical first termination is hollow to allow for accepting a connection such as from a battery cable. In addition there may be sense leads present on the resistor. A method of forming a substantially cylindrical resistor includes forming a hollow cylindrical resistor body by rolling a flat sheet comprising a resistive element and a first termination and a second termination joined on opposite ends of the resistive element.
1. A resistor comprising:
a substantially cylindrical resistive element;
a substantially cylindrical first termination electrically connected to the resistive element;
a second termination electrically connected to the resistive element; and
wherein the substantially cylindrical first termination is hollow to allow for accepting a connection; and wherein
the resistive element and the substantially cylindrical first termination and the second termination are formed from a sheet rolled into a cylindrical resistor body.
2. The resistor of claim 1 , further comprising a first sense lead electrically connected to the first termination and a second sense lead electrically connected to the second termination.
3. The resistor of claim 1 , further comprising at least one slot in the resistive element or the substantially cylindrical first termination to facilitate roll forming.
4. The resistor of claim 1 , wherein the resistive element is a cylindrical wire.
5. The resistor of claim 4 , wherein the first termination comprises a first conductive tube and wherein the second termination comprises a second conductive tube.
6. The resistor of claim 1 , wherein the second termination is substantially cylindrical and hollow to allow for accepting a second connection.
7. The resistor of claim 1 wherein the second termination includes a flat terminal area.
8. The resistor of claim 7 , further comprising an aperture in the flat terminal area.
9. The resistor of claim 1 , wherein the first termination and the second termination and the resistive element are hollow and a fluid or gas is circulated through the resistor to control temperature of the resistive element.
10. A method of forming a substantially cylindrical resistor, comprising:
forming a free-standing hollow cylindrical resistor body by rolling a flat sheet comprising a resistive element and a first termination and a second termination joined on opposite ends of the resistive element;
wherein at least one of the first and second terminations is made of a material different than the material of the resistive element.
11. The method of claim 10 , wherein the resistive element has a resistance of less than 1 mΩ.
12. The method of claim 10 , further comprising adjusting resistance of the substantially cylindrical resistor by cutting the resistive element.
13. The method of claim 10 , further comprising adjusting resistance of the substantially cylindrical resistor by adding material to the cylindrical resistor body.
14. The method of claim 13 , wherein the material is additional resistive material.
15. The method of claim 13 , wherein the material is additional termination material.
16. The method of claim 10 , further comprising cutting slots in the flat sheet to facilitate rolling.
17. The method of claim 10 , further comprising attaching sense leads to the resistor body.
18. A resistor, comprising:
a substantially cylindrical resistive element;
a first termination electrically connected to the resistive element;
a second termination electrically connected to the resistive element;
wherein the first termination forms a hollow body for accepting a connection;
a first sense lead electrically connected to the resistive element; and
a second sense lead electrically connected to the resistive element;
wherein the resistive element and the substantially cylindrical first termination and the second termination are formed from a sheet rolled into a cylindrical resistor body.