Battery Sleep Control for Cell Voltage Deterioration

The patent divides the large storage battery system into smaller management units. A control device is introduced that can individually manage and monitor groups of cells, breaking down the overwhelming complexity of monitoring tens of thousands of cells into manageable segments. Each segment can be monitored independently, making it feasible to track individual cell states even in large-scale systems.

The control device acts as an intermediary between the energy management system and the storage battery. It receives charge/discharge requests from the energy management system and translates them into cell-level control commands. This intermediary layer enables fine-grained monitoring and control of individual cells without requiring the energy management system to directly handle every cell, thus resolving the monitoring capability issue in large-scale systems.

The control function is segmented into two layers: the energy management system handles overall power balance at a macro level, while the control device handles individual cell management at a micro level. This segmentation allows the EMS to focus on high-level decision-making without being burdened by detailed cell-level control calculations, maintaining both overall efficiency and fine-tuned control capability.

The control device serves as an intermediary that translates macro-level charge/discharge requests from the EMS into micro-level control actions for individual cells. It performs the detailed arithmetic calculations and control adjustments needed for fine-tuned cell management, while the EMS maintains its focus on overall power system balance, thus preserving both productivity and ease of operation.

The voltage monitoring and control is segmented from the aggregate battery level to the individual cell level. The control device monitors each cell's voltage separately and can apply sleep control to specific cells or groups of cells independently. This segmentation ensures that individual cell voltages remain within the holding voltage range, preventing accelerated deterioration even though it increases system complexity compared to whole-battery control.

Sleep control parameters and thresholds are applied locally to individual cells or cell groups based on their specific voltage states rather than using a uniform approach for the entire battery. This local quality approach allows the system to maintain higher reliability by addressing the specific needs of each cell while keeping the control logic manageable through the control device's coordination.