ohms law

Why Do Wound Cells Typically Have Higher Internal Resistance Than Z‑Stack Cells?

tabbed vs tabless cell electrodes

AION Engineering INC In lithium‑ion battery design, internal resistance is one of the most critical parameters governing power capability, heat generation, fast‑charge performance, and overall efficiency. The difference in internal resistance between wound (spiral/jelly‑roll) cells and Z‑stack (stacked) cells is often misunderstood as a chemistry issue, while in reality it is largely a current‑path and … Read more

Battery Pack Resistance

Battery pack resistance equation

Battery pack resistance is an important parameter to calculate and understand. The DCIR of a cell is the Direct Current Internal Resistance. This is the resistance in charge and discharge to a direct current demand applied across the terminals. If we connect cells in parallel and series, the estimation of the total resultant resistance is … Read more

Calculated Peak Power

DCIR and ohms law

For most simple peak power calculations we will be interested in the Direct Current Internal Resistance (DCIR) value for a new cell at 50% SOC (25°C, 10s), Open Circuit Voltage (OCV) and minimum voltage. Note: this is just an estimation and this needs to be compared to the manufacturers specifications and tested values. However, as … Read more

Cell Resistance Metric

heat generation in a battery cell

When looking for the best performing battery pack the internal resistance of the cell plays a significant role. Simple Ohm’s Law shows that as we deliver a voltage we get a voltage drop equal to the current times the resistance. The heat generation in a cell is a summation of Joule and Entropic heating. At … Read more