Dataset for multi-dimensional electrical performance characterization of large-capacity mining power lithium-ion...

To address the issue of performance degradation due to calendar aging caused by long-term storage of mining power batteries before shipment and installation underground, this paper presents a comprehensive dataset of measured electrical and physical performance from the early stages of calendar aging for 228 Ah commercial prismatic lithium iron phosphate cells under multi-temperature, multi-SOC coupled conditions. The entire aging test period spanned from 20 September 2024 to 16 May 2025. The test setup included three storage temperatures (25°C, 45°C, and 60°C) and four idle SOC levels (30%, 50%, 80%, and 100%), resulting in six cross-comparison test conditions. For each cell, nine cycles of constant-temperature idling and 10 rounds of comprehensive, synchronized electrochemical characterization were conducted at fixed 7-day intervals. Specifically, under the 60°C/50% SOC condition, cell B4 failed after 35 days of storage due to an irreversible sudden increase in internal resistance. The dataset comprehensively includes capacity decay data at each aging milestone, 30-second HPPC pulse test data compliant with the FreedomCar standard, segmented static OCV-SOC calibration curves, and electrochemical impedance spectra across the full frequency range of 0.001-1000 Hz. It also includes measured data on two types of physical deformation: multi-point thickness expansion and changes in cell weight. All raw data were batch-extracted and standardized using MATLAB software. Zview software was used in conjunction with a PEEC equivalent circuit-which has clear physical significance-to fit and solve the impedance spectra. This yielded a series of quantified derived characteristic parameters, including SEI film impedance, charge transfer resistance, and Warburg diffusion resistance. Existing publicly available aging datasets primarily focus on small-capacity consumer battery cells. This dataset fills a gap in experimental measurement data for early-stage temperature-SOC-coupled calendar aging in high-capacity lithium-ion batteries for mining applications. The dataset provides raw experimental records that researchers can use to study calendar aging-induced capacity degradation, develop SOC and SOH estimation algorithms for mining equipment BMS, and investigate temperature-control strategies for standardized storage and transportation of idle batteries underground.