The current flow within a Li-ion battery and magnetic field gives rise to a magnetic field which is measured by an magnetometer array. The image shows a combination of current collectors and electrodes while the separator is suppressed for clarity.

Contexts in source publication

Context 1

... overview of the system can be seen in Fig. 1. A 2 nd generation AESC pouch battery, with a rated capacity of 66 A h, is disassembled to extract a single cell [36]. Each cell is composed of 35 electrode pairs, in addition to aluminium and copper current collectors, the dimensions of which are 22 cm × 26 cm. The battery is situated 6 mm below a 4 × 4 fluxgate array (FGA) of ...

Context 2

... While the changes correspond to a small fraction of the total magnetic field -around 1%, they can be clearly identified above the noise. Note that the changes around the respective battery tabs are not symmetric, but emerge at different SoC. The changes in the two field components do, to a large extent, reflect the nature of the fields shown in Fig. 1. As the changes are around 100 times larger than the noise level of the battery cycler, changes in the charging current are unable to explain the observed changes. Nor is the change in effective conductivity associated with different lithiation states expected to be large enough to account for this effect. Likewise, relative movements ...