Abstract In-situ EIS and ex-situ EIS are the two primary approaches for battery impedance characterization, but their data reliability differs substantially. This comparative study on 100 mAh pouch cells demonstrates that in-situ EIS achieves a coefficient of variation (cov) of ≤1% for both Rs and…
Abstract Crushing strength is the compressive load an individual electrode particle can withstand before mechanical fracture, measured via single-particle compression testing and expressed relative to particle size per methods such as Chinese National Standard GB/T 43091-2023. For artificial graphite (also called synthetic graphite) versus natural…
1. Overview As the core of the modern energy system, batteries are widely used in various critical fields such as consumer electronics, power batteries, and energy storage systems. A reliable battery test system is not only the foundation of R&D…
Abstract DCIR, short for Direct Current Internal Resistance, is the total internal resistance of a lithium-ion battery, calculated from Ohm’s Law based on the voltage response to an applied current pulse: $R = \Delta V / \Delta I$. A DCIR…
Abstract Electrode tortuosity quantifies the geometric complexity of ion transport pathways within a battery electrode’s pore network—defined as the ratio of the actual lithium-ion migration distance through the pores to the straight-line electrode thickness. Higher tortuosity means longer, more convoluted pathways…
Abstract Separator ionic conductivity increases as temperature rises, primarily because higher temperature lowers electrolyte viscosity and accelerates lithium-ion migration through the ionic separator’s porous structure. Testing on Separator A using the IEST EIC2400M multi-channel ionic conductivity test system shows conductivity…
Abstract BYD Blade Battery 2.0 is the second-generation cell platform from BYD, officially released on March 6, 2026, delivering an energy density of 190–210 Wh/kg, ultra-fast charging performance, and over 1,000 km of real-world driving range in flagship vehicles. According to…
Abstract Cyclic voltammetry (CV) analysis quantifies lithium-ion battery electrode kinetics, electrochemical reversibility, and capacity degradation by evaluating peak currents and potential shifts across linear voltage sweeps. This case study demonstrates practical CV graph interpretation and lithium-ion diffusion coefficient calculation ($D…
Abstract A charge-discharge test on battery cycler equipment is built from individual test steps, each defining a fixed control mode (constant current, constant voltage, constant power, etc.), a primary control parameter, and a transition condition that ends the step. This…
Abstract Electrochemical Impedance Spectroscopy (EIS) battery testing characterizes a cell’s internal electrochemical processes — SEI resistance, charge transfer kinetics, and solid-state diffusion — by measuring AC impedance across a frequency spectrum from 0.01 Hz to 100 kHz. Two primary EIS…
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