Abstract
An electrochemical thermal coupling model of lithium battery was established to study the heat generation characteristic in this study. The simulation results showed that the heat generation density of the battery increased with the discharge rate. With the discharge process, the heat generation density of the battery increased continuously. With 2.5C discharge rate, the heat generation density at the end of discharge was 1.82 times of that at the beginning of discharge. The heat generation density at different areas of the battery was not uniform and 46% of the total ohmic heat was generated near the electrode tabs. A cooling plate with variable mini-channels was designed to improve the temperature non-uniformity caused by the heat generation characteristic. A cooling plate with uniform mini-channels was designed for compared experiment. The experiments were conducted with deionized water and refrigerant R141b and carried out with 1.5C, 2C and 2.5C discharge rates. Experimental results showed that the cooling plate with variable mini-channels had a better cooling performance in both single-phase and two-phase cooling conditions.
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Abbreviations
- c 1 :
-
Li+ concentration in liquid phase/mol·m−3
- F:
-
Faraday constant, 96 485 C·mol−1
- i :
-
current density/A
- i app :
-
applied current density/A·m−2
- j loc :
-
local current density/A·m−2
- L neg :
-
thickness of negative electrode/m
- L pos :
-
thickness of positive electrode/µm
- L sep :
-
thickness of separator/µm
- N 1 :
-
liquid ion flux/A·m−2
- Q act :
-
active heat generation/J
- Q ave :
-
average heat generation density/J
- Q cc :
-
heat generation of current collectors/J
- Q ohm :
-
Ohmic heat generation/J
- Q rea :
-
reaction heat generation/J
- Q total :
-
total heat generation/J
- S :
-
entropy/J·mol−1·K−1
- S a :
-
specific surface area/m−1
- T :
-
temperature/°C
- U i :
-
open circuit potential/V
- δ cc :
-
thickness of current collector/µm
- η :
-
over potential/V
- σ 1 :
-
electric conductivity for liquid phase/S·m−1
- σ s :
-
electric conductivity for solid phase/S·m−1
- φ :
-
potential/V
- 0:
-
initial state
- act:
-
active heat
- cc:
-
current collector
- i :
-
neg/negcc/pos/poscc
- l:
-
liquid phase
- neg:
-
negative electrode
- ohm:
-
Ohmic
- pos:
-
positive electrode
- rea:
-
reaction heat
- s:
-
solid phase
- sep:
-
separator
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Acknowledgements
This work was supported by the National Key R&D Program of China (2019YFE0104900).
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Ren, H., Jia, L., Dang, C. et al. Experimental Investigation on Pouch Lithium-ion Battery Thermal Management with Mini-Channels Cooling Plate Based on Heat Generation Characteristic. J. Therm. Sci. 31, 816–829 (2022). https://doi.org/10.1007/s11630-022-1586-9
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DOI: https://doi.org/10.1007/s11630-022-1586-9