4. Conclusion(s)

shown in Figures 11 and 12. As with the previous tests, what was important was the control of temperature between acceptable limits and a good uniformity of temperature across each cell. It can be seen from Figures 11 and 12 that in the early stages of cooling, non-uniformity was found, but after, say, 1 min, uniformity was acceptable throughout each cell, and after 2 min, each cell was within the desired operating temperature limits (Note: each sub-figure has its

142 Heat and Mass Transfer - Advances in Modelling and Experimental Study for Industrial Applications

Figure 10. Temperature profiles in the radial direction for Tinit ¼ 313:15 K, uin ¼ 0:01 m/s, rinner ¼ 10 mm, T<sup>∞</sup> ¼ 293:15 K,

Figure 11. Front view of temperature profiles for Tinit =313.15 K, uin ¼ 0:01m=s, rinner ¼ 10 mm, Tin ¼ 293:15 K,

Tin ¼ 293:15 K.

and heat source within each cell of 1 W:

Preliminary results useful to the final design of a prototype battery module have been produced. The values found for the important parameters help in confirming the chosen geometry, and give indications of necessary pump and heating/refrigeration specifications needed when assembling the prototype. The calculations were made first inside a given battery cell to indicate what sort of temperature differences may be expected. It was found that these calculations depended heavily on experimental work to find appropriate coefficients for the coupled equations. After getting the range of temperatures arising from single battery cell calculations, a method was developed to find the temperature characteristics of the battery module, with stress being put on uniformity of temperature both within an individual cell and across the complete battery module.

Ls separator thickness

rea heat generation due to electrochemical reaction

Effectiveness of a Helix Tube to Water Cool a Battery Module

http://dx.doi.org/10.5772/intechopen.74113

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Pr Prandtl number

rev reversible heat

Q\_ ohm ohmic heat

r radius/radial

T temperature

t time

R universal gas constant

<sup>þ</sup> transference number

T<sup>∞</sup> ambient temperature T<sup>0</sup> reference temperature

Tw wall temperature

Ui open circuit voltage xi spatial coordinates

yv viscous sublayer thickness

y<sup>þ</sup> dimensionless velocity

β constant, Boussinesq model

ε<sup>0</sup> volume fraction of electrolyte

λ coefficient, Newton's cooling law

U mean velocity

Greek letters

ε dissipation

η<sup>i</sup> overpotential

κ von Karman constant

μ absolute viscosity

r density

qw wall heat flux

Q\_

Q\_

t 0
