At the heart of the Chevrolet Volt is a complex battery management system that guarantees the safety and reliability of multi-cell lithium-ion battery blocks. GM engineers have also built a 58% to 65% SoC safety window. This article illustrates the Chevrolet BMS. design.
At the heart of the Chevrolet Volt is a sophisticated battery management system that guarantees the safety and reliability of multi-cell lithium battery blocks. The battery block provides power to the Volt's driveline on demand. In this management system, the battery monitoring board uses two key subsystems to monitor the condition of the battery cells and send the digital results to a main processor that coordinates the operation of the system. A signal interface isolates these subsystems to ensure insulation between the high voltage battery detection circuitry and the onboard communication components.
At a given temperature and output current value, a lithium-ion battery maintains a near-smooth voltage output in the middle of its capacity range - a feature that highlights the advantages of using a lithium-ion battery as a power source, but also enables engineers With simple battery voltage measurements, attempts to provide users with remaining battery capacity (or SoC, charge state) have become complicated. For Volt drivers, estimating the car's travel is critical to accurate measurement of the SoC. Keeping the SoC within a specific range is also important to ensure that the battery has a long life; batteries that are kept too high or too low in charge tend to degrade faster than batteries that remain in a medium charge state.
In the Volt, GM engineers built a 58% to 65% SoC security window. This window sets the lower limit of the normal driving mode to 30% of the SoC according to different driving modes; the upper limit of the mountain driving mode is set to 45% of the SoC. When the vehicle reaches the lower limit of the SoC, the gasoline The engine intervenes to extend the mileage. The battery interface control module board provides the required data to ensure that the Volt operates with a reliable SoC.
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