Advancements in Battery Technology Moving Forward in Small Incremental Steps
In the pursuit of electric vehicle (EV) excellence, Porsche is leaving no stone unturned in its mission to improve the durability and usability of lithium-ion batteries.
To ensure the reliability of its batteries, Porsche subjects them to rigorous testing. Simulating 300,000 kilometers of charging and discharging cycles, half of the charging processes occur in rapid charging mode. This testing regime is designed to replicate real-world driving conditions and push the batteries to their limits.
An elaborate test stand is used to simulate all possible driving situations, allowing Porsche to assess the batteries' performance under various conditions. The company has also adopted measures to make batteries more robust. These include robust cell chemistry, a Battery Management System (BMS) for appropriate control of current and voltage, active heating and cooling, and keeping battery temperatures below 60 degrees.
Maintaining batteries in an optimal environment, controlling charging and discharging currents, and keeping temperatures within the correct range can mitigate lithium plating, a phenomenon that can lead to capacity losses in batteries. Low temperatures increase resistance and hinder ion diffusion, contributing to lithium plating.
As the battery's charge increases, its resistance also increases, which can lead to a deterioration in the health state (State of Health / SOH) of the batteries. This, in turn, reduces their capacity and performance over time. To combat this, Porsche is aiming to significantly extend the life of its batteries compared to current technologies, although specific target figures are not yet detailed.
Safety is a paramount concern with batteries, especially in extreme temperatures and high-energy arcing in an 800-volt system like Porsche's. Porsche is committed to addressing these concerns to ensure the safety and reliability of its EVs.
In conclusion, Porsche's rigorous testing, robust battery design, and innovative approaches to battery management are paving the way for a future of reliable and long-lasting electric vehicles.
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