Batteries: thermoelectric and photoelectric – Thermoelectric – Peltier effect device
Patent
1994-05-24
1995-08-15
Walsh, Donald P.
Batteries: thermoelectric and photoelectric
Thermoelectric
Peltier effect device
136204, 136224, 136237, H01L 3508
Patent
active
054415764
ABSTRACT:
A thermoelectric heat pump which is resistant against thermal stresses incurred during thermal cycling of Thermal Cyclers or the like between cold and hot temperatures of about 0.degree. C. at a ramping rate up to about 1.degree. C. per second has improved joints between the thermoelements and electrical conductors which have low electrical resistance and which substantially reduce fractures during thermal cycling. The joints include a tin-silver-indium solder containing by weight about 95% tin, 3.5% silver, and 1.5% indium, or a tin-silver-cadmium solder containing by weight about 95.5% tin, 3.5% silver, and 1.0% cadmium. A robust nickel diffusion barrier between the joints and thermoelectric elements ends provides additional improvement against joint fracture.
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Bierschenk James L.
Howarth Richard A.
Socolowski Norbert J.
Carroll Chrisman D.
Walsh Donald P.
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