Factors affecting the performance of thermoelectric cooler (Ⅱ)

2.Weld resistance

As each of thermoelectric elements weld thermal couple, there are 4 places in the TEC needing to be welded, so there are 4 weld resistances. The weld resistance includes solder resistance and contact resistance. The solder resistance is proportional to the thickness of the solder, and the contact resistance is related to the size error of galvanic elements and welding process. If the size error is big, more solder will fill between the short component and the metal film, so it will generate more contact resistance after welding. If the weld resistance is increased, optimal value coefficient will decline.

3. Heat dissipation exchange

Inside the piles, cool leakage is inevitable, which is divided into radiation leakage and convection cooling. If galvanic elements are arranged more densely, radiation and convection cool leakage will become smaller.

4. Component performances

Reason for the decline of component performance is mainly mechanical damage, thermal shock and copper infiltration. The mechanical damage is produced by the material cutting. After components and conductive metal plates are welded together, copper atoms may penetrate into components, which is called copper infiltration phenomenon. Copper infiltration can lead thermal performance to decline.

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