Abstract
Large-format lithium-ion batteries (LIBs) suffer from problems in terms of their product life and capacity due to large temperature differences in LIB cells. This study analyzes the effect of design factors on temperature distribution using a 3D electrochemical–thermal model. The design of experiments methodology is used to obtain the sampling points and analyze the effect of the cell aspect ratio, negative tab attachment position, and positive tab attachment position. These were considered as design factors for the maximum and minimum temperatures, as well as their difference, in large-format LIB cells. The results reveal that the cell aspect ratio, negative tab attachment position, and positive tab attachment position considerably influence temperature distribution. The cell aspect ratio has the most significant effect on the temperature distribution by changing the longest current pathway and the distance between tabs and the lowest temperature point in the LIB cell. A positive tab attachment position affects the maximum temperature, minimum temperature, and the temperature difference due to the heat generation caused by the high resistance of aluminum, which the positive tab is made. Furthermore, a negative tab attachment position affects the minimum temperature due to low resistance.
Highlights
Accepted: 15 December 2020Recently, the demand for large-format lithium-ion batteries (LIBs) has increased due to the popularity of electric vehicles [1,2,3,4]
The LIB cell was discharged with the constant current of 3It
The effect of the negative and positive tab attachment position on the maximum and minimum temperatures in the LIB cell were assessed by applying the longest current pathway
Summary
Accepted: 15 December 2020Recently, the demand for large-format lithium-ion batteries (LIBs) has increased due to the popularity of electric vehicles [1,2,3,4]. A large-format LIB has a large temperature difference (Tdiff ) in the LIB cell due to the large dimensions of the cell. The temperature difference in the LIB cell causes critical problems, such as a rapid reduction in its capacity [5,6,7]. In order to solve the problems caused by the temperature difference in the LIB cell, several studies involving experiments and numerical models have been conducted. In the early 1990s, Newman and his colleagues developed an electrochemical–thermal model of LIBs by using the porous electrode theory for calculating the temperature in the LIB cell through numerical methods [8,9]. Newman’s model had a limitation since it only predicted the temperature distribution in the thickness direction of the LIB cell
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