Repairability of NiMH batteries research
The development of electric vehicles is in full swing worldwide. This transition is driven, among other things, by climate goals aimed at reducing CO₂ emissions and improving urban livability by decreasing air pollution such as NOx and particulate matter. This large-scale industrial shift is leading to a transition from an energy system reliant on fuel consumption to one that is material-intensive. We have conducted a subsidized study on the repairability of hybrid batteries to extend their usage phase.
The research specifically focused on hybrid batteries that use Nickel-Metal Hydride (NiMH) cells. These hybrid batteries are found in vehicles such as the Toyota Prius and Honda Civic. The study revealed that the charging and discharging strategy applied in these vehicles (shallow Depth of Discharge) has the advantage of increasing the maximum charge and discharge cycles. However, the downside is that it can structurally alter the electrode material. In other words, this means that the battery capacity deteriorates prematurely, and an imbalance can develop within the battery pack.
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