This invention is a sealed battery case and a method for making it, including a brazed ceramic ring that separates the positive and negative ends of the battery while providing a leak-tight seal. A brazing material is used that comprises greater than 50% gold. The case is strong, and can be negative
This invention is a sealed battery case and a method for making it, including a brazed ceramic ring that separates the positive and negative ends of the battery while providing a leak-tight seal. A brazing material is used that comprises greater than 50% gold. The case is strong, and can be negative, neutral, or positive, withstanding more than 3.5 V vs. Li/Li+.
대표청구항▼
We claim: 1. A battery comprising: a battery case including a first ring that includes a ceramic material, a second ring sealed to the first ring, the second ring including a first metal and being bonded to an open end of a cylinder, and a third ring sealed to the first ring, the third ring being b
We claim: 1. A battery comprising: a battery case including a first ring that includes a ceramic material, a second ring sealed to the first ring, the second ring including a first metal and being bonded to an open end of a cylinder, and a third ring sealed to the first ring, the third ring being bonded to a cap for the battery case electrodes housed in the battery ease such that the cylinder surrounds the electrodes; and an electrolyte activating the electrodes in the battery case. 2. The battery of claim 1, wherein the battery case includes a positive current carrying element of the battery. 3. The battery of claim 2, wherein the positive current carrying clement exhibits more than 3.5 V vs. Li/Li+. 4. The battery of claim 2, wherein the positive current carrying element exhibits more than 4.1 V vs. Li/Li+. 5. The battery of claim 2, wherein the positive current carrying element exhibits more than 4.3 V vs. Li/Li+. 6. The battery of claim 1, wherein the battery is a lithium battery. 7. The battery of claim 1, wherein the end cap is negatively charged. 8. The battery of claim 1, wherein the cylinder has a closed end. 9. The battery of claim 1, wherein the cap includes a feedthrough hole. 10. The battery of claim 1, wherein the second ring is bonded to the open end of the cylinder such that a lower edge the second ring is on top of an upper edge of the cylinder. 11. The battery of claim 1, wherein the third ring is bonded to the cap such that the cap is on top of an upper edge of the cylinder. 12. The battery of claim 1, wherein the first ring is positioned between the second ring and the third ring. 13. The battery of claim 1,wherein a lower edge of the third ring is on top of an upper edge of the first ring and a lower edge of the first ring is on an upper edge of the second ring. 14. The battery of claim 1, wherein a gold alloy braze seals the second ring to the first ring, the gold alloy braze being more than 50 wt/% gold. 15. The battery case of claim 14, wherein the gold alloy braze has a gold content of more than 70 wt %. 16. The battery case of claim 15, wherein the gold alloy braze includes 96.4% gold, 3.0% nickel, and 0.6% titanium. 17. The battery of claim 1, wherein a gold alloy braze seals the third ring to the first ring, the gold alloy braze being more than 50 wt % gold. 18. The battery case of claim 17, wherein the gold alloy braze has a gold content of more than b 70 wt/%. 19. The battery case of claim 17, wherein the gold alloy braze includes 96.4% gold, 3.0% nickel, and 0.6% titanium. 20. The battery of claim 1, wherein a weld attaches the third ring to the cylinder. 21. The battery of claim 1, wherein the ceramic material is selected from the group consisting of: alumina, zirconia, tetragonal zirconia, stabilized-zirconia, partially-stabilized zirconia, yttria-stabilized zirconia, magnesia-stabilized zirconia, acne-stabilized zirconia, calcia-stabilized zirconia, and titania. 22. The battery case of claim 1, wherein the cylinder and the second ring include the same metal. 23. The battery case of claim 1, wherein the end cap and the third ring include the same metal. 24. The battery of claim 1, wherein the second ring includes a material chosen from the group consisting of titanium and alloys thereof. 25. The battery of claim 1, wherein the third ring includes a material chosen from the group consisting of titanium and alloys thereof. 26. The battery of claim 1, wherein the cylinder has a closed end; the cap includes a feedthrough hole; the first ring is positioned between the second ring and the third ring such that a lower edge of the third ring is on top of an upper edge of the first ring and a lower edge of the first ring is on an upper edge of the second ring; the second ring is bonded to the open end of the cylinder such that a lower edge the second ring is on top of an upper edge of the cylinder; the third ring is bonded to the cap such that the cap is on upper edge of the cylinder; and a weld attaches the third ring to the cylinder. 27. The battery of claim 26, wherein gold alloy brazes seal the second ring to the first ring and the third ring to the first ring the gold alloy brazes being more than 50 wt % gold; the ceramic material is selected from the group consisting of: alumina, zirconia, tetragonal zirconia, stabilized-zirconia, partially-stabilized zirconia, yttria-stabilized zirconia, magnesia-stabilized zirconia, ceria-stabilized zirconia, calcia-stabilized zirconia, and titania; the second ring and the third ring each include a material chosen from the group consisting of titanium and alloys thereof. 28. The battery of claim 1, wherein gold alloy brazes seal the second ring to the first ring and the third ring to the first ring, the gold alloy brazes being more than 50 wt % gold; the ceramic material is selected from the group consisting of: alumina, zirconia, tetragonal zirconia, stabilized-zirconia, partially-stabilized zirconia, yttria-stabilized zirconia, magnesia-stabilized zirconia, ceria-stabilized zirconia, calcia-stabilized zirconia, and titania; the second ring and the third ring each include a material chosen from the group consisting of titanium and alloys thereof.
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