A qualitative leap in battery energy management
Mercedes-Benz is currently developing a new technology aimed at radically changing how high-voltage electric vehicle batteries operate. This technology relies on the use of "micro-converters" capable of controlling the charging and discharging process for each individual cell inside the battery pack, which is a fundamental shift from traditional systems that treat the battery pack as a single integrated unit.
How does the new technology work?
In current systems, thousands of cells assembled in modules are treated as a single block; when the motor requests power or the battery is charged, all cells receive the same treatment. With Mercedes' technology, however, each cell becomes monitorable and subject to precise programmable control. This approach offers several technical advantages:
- Extending battery life: If a specific cell fails or loses its ability to maintain voltage, its dedicated micro-converter can disable it programmatically, allowing the battery and vehicle to continue operating without needing to replace the entire pack.
- Chemistry and voltage flexibility: The technology allows the integration of cells with different chemistries or voltage levels within a single pack, as the converters regulate the power flow for each of them individually.
- Simplifying components: By distributing the conversion process across multiple converters operating in parallel, bulky electronic components responsible for AC/DC conversion can be eliminated.
What does this mean for users?
This technology promises to increase the efficiency of future electric vehicles by providing more precise control over energy consumption. For example, the battery management system can put parts of the pack into standby mode when driving short distances, and activate full capacity when long trips are needed. The technology also includes built-in support for bi-directional charging, enhancing the flexibility of battery usage.
Technical challenges
Despite the promising advantages, a technical challenge arises in the form of increased system complexity; having thousands of micro-converters inside the battery pack means an increase in the number of components that could be prone to failure. The success of this technology ultimately depends on the reliability of these components and the software's ability to manage this high level of operational complexity.