Battery Technology Handbook by H.A. Kiehne

By H.A. Kiehne

The main entire advisor to the basic theories, ideas, and methods applied for battery operation and layout. retains experts educated of the present country of the sector with new and revised chapters concentrating on the protection, functionality, caliber, and enhancement of varied batteries and battery structures. encompasses a huge rage of examples, dimensions, and requirements for transparent realizing of the subject.

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Copyright © 2003 by Expert Verlag. All Rights Reserved. 8 The current/voltage curve. The horizontal axis (abscissa) represents polarization Z ¼ U À Uo , the vertical axis (ordinate) current density i, which is synonymous to the reaction rate. io is the exchange current density that characterizes the dynamic equilibrium. According to Eq. (14), polarization is the sum of overvoltage and ohmic voltage drop. In practice polarization is always determined. The reaction of the lead electrode is inserted as an example.

Due to the uncertain thermodynamic data, these calculations are only rough approximations, but correspond with practical experience. During the initial two sections of the charging period, slight cooling is observed on account of the reversible heat effect that consumes heat at a constant rate proportional to the current. 3 and Fig. 10). Thus, during the final sections of the charging period, a growing amount of heat is generated. 25 Wh. The main reason is that the reversible heat effect generates additional heat during discharge, while it compensates for heat generation during charging.

G. the container wall) in m. 5. It shows that heat conductivity is fairly high for materials that are used within the battery, like the various metals or water. As a consequence, the internal heat flow widely equalizes the temperature within the battery. When metal is used as container, the temperature drop across its wall can be neglected. For plastic materials l is in the order of 0:2 W ? mÀ1 ? KÀ1 . Thus heat conduction through the container wall can be approximated dQ=dt ¼ 200 DT=d W=m2 per K for d mm of wall thickness ð48Þ which means for a wall thickness of 4 mm dQ=dt&50 W ?

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