For the sake of comprehend the influence of locally enhanced heat dissipation
of the polar on Li-ion power batteries, coupling the thermal effect of anode
and cathode, the heat generation model of Li-ion battery with different
discharge magnification is obtained. Based on this model, the discharge
process simulation analysis of the single battery is carried out and
compared with the experimental results. The experiment results show that
battery polarity heat effect has great influence on the temperature field
distribution of the battery. Then, a locally enhanced heat dissipation
structure is set up near the polar region and a comparative experiment is
carried out by changing the discharge rate. Although the heat pipe can only
slightly improve the discharge capacity of lithium ion battery by enhancing
the heat dissipation capability of polarity, the heat generated under low
discharge rate can be reduced by using the heat pipe with low emission rate,
the heat generated by the polar region can be effectively and timely
exported to reduce the temperature of the polar region and it can greatly
reduce the overall temperature of the battery. Then, according to the
thermal characteristics and the results of locally enhanced heat dissipation
analysis, a new battery module is designed and simulated. And the prototype
is completed and tested. The results show that this method can effectively
reduce the temperature rise and temperature difference of the battery module
by using locally enhanced heat dissipation structure. Finally, combined with
the simulation and the experimental results, some useful suggestions are put
forward for the design and manufacture of battery modules and battery boxes.
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