Experimental Characterization Data for Battery Modules with Parallel-Connected Cells across Diverse Module-Level State of Health and Cell-to-Cell Variations
Description
When using the data, users should cite the dataset descriptor (https://doi.org/10.48550/arXiv.2604.16769) (given by the link below), rather than the dataset itself on Mendeley Data. This experimental dataset presents both module-level and cell-level characterization data for lithium-ion battery modules composed of three parallel-connected inhomogeneous cells across a wide range of module-level state of health (M-SoH) and cell-to-cell variation (CtCV). First, 70 cells are aged to establish an inventory with cell-level state of health (C-SoH) ranging approximately from 100% to 80% (80% is considered as the end-of-life for automotive applications). From this inventory, 78 battery modules are then assembled, each exhibiting a distinct M-SoH value (from 100% to 80.98%) and a unique CtCV value (from 0% to 9.31%, defined as population standard deviation of C-SoH within each module). Module-level characterization data are collected under 25°C at 0.5C and 0.25C conditions, enabling extraction of module-level capacities and supporting diagnostic analyses such as incremental capacity analysis and differential voltage analysis. Before a module is assembled and tested, cell-level characterization tests are conducted for every individual cell within that module under 1C conditions, enabling direct quantification of CtCV and providing accurate labels for cell-level capacities and internal resistances. The dataset is organized with both raw time-series data and processed summary information such as C-SoH, M-SoH, and CtCV for all modules. With the paired module-level and cell-level characterization data, this dataset enables understanding and development of advanced degradation monitoring mechanisms for battery modules with parallel-connected cells in the presence of CtCVs.
Files
Steps to reproduce
Detailed descriptions can be found in the dataset descriptor (https://doi.org/10.48550/arXiv.2604.16769) (given by the link below). (1) Module Characterization Tests: Tests are performed for 78 modules. All modules consist of 3 parallel-connected inhomogeneous cells, exhibiting a wide span of module-level state of health (M-SoH) and cell-to-cell variation (CtCV). Maccor S4000 executes constant-current-constant-voltage (CC-CV) charging and constant-current (CC) discharging at 0.5C and 0.25C under 25°C ambient temperature. (2) Cell Characterization Tests: Tests are conducted on every cell within each of 78 modules, providing direct quantification of CtCV within battery modules. Maccor S4000 executes CC-CV charging, CC discharging, and pulsed charging/discharging tests at 1C and 25°C ambient temperature.
Institutions
- University of MichiganMichigan, Ann Arbor