Effect of experimental conditions on the precision of estimated LIB thermal parameters via non-dimensional analysis

doi:10.19799/j.cnki.2095-4239.2020.0279

Abstract

Abstract:

Thermal parameter estimation, of fundamental importance for thermal design and management of lithium-ion batteries (LIBs), is challenging as LIBs possess complicated structure with remarkable heterogeneities. The experimental setup to estimate these thermal parameters have many conditions at play, the influence of which on the precision of the estimation methods is yet largely unclear. Employing a non-dimensional thermal model of LIB, we analyze how these experimental conditions, including the radius and applied power of the circular planar heater, the placement of thermocouples, the heating duration, and the thickness of the LIB, dictate the precision of a thermal parameter estimation method we developed recently. Generally, a higher power of the heater leads to higher precision, but there is an upper bound imposed by the safety concerns. we identify the lateral limit for the placement of thermocouples, which is extended when the heater's power is higher. The allowable range of heating duration is reduced at greater ratio of the parallel to perpendicular thermal conductivity. In addition, the thermal parameter estimation method following the non-dimensional approach enjoys a much wider applicability for thermal conductivities of the LIBs with lower thickness-width ratio.

Key words: lithium-ion batteries, thermal parameter estimation, experimental conditions, nondimensionalization, sensitivity analysis

CLC Number:

TQ 152

Guanxing TENG, Junyi QI, Hao GE, Zhe LI, Jianbo ZHANG. Effect of experimental conditions on the precision of estimated LIB thermal parameters via non-dimensional analysis[J]. Energy Storage Science and Technology, 2021, 10(1): 250-260.

Figures/Tables 7

Fig. 1

Table 1

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Table 2

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Table 3

Fig. 4

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Features	Methods
Features	Calculation	Calorimetry	XFT	TPS	MTPS
In-situ	-	√	√	√	√
Simultaneous	√	-	-	-	√
Non-homogeneous feasible	√	√	-	-	√

Case number	d/10^-3 m	R/10^-3 m	e	R_h/10^-3 m
1	7.1	35	0.2028	3.33
2		70	0.1014	5
3		105	0.0676	10
4	14.2	35	0.4057	3.33
5		70	0.2028	5
6		105	0.1352	10
7	21.3	35	0.6086	3.33
8		70	0.3043	5
9		105	0.2028	10

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