SOC/SOH-based ship battery control and management system

Ship power control maintaining generator load at 80–85% via SOC/SOH-linked charge/discharge

This technology optimizes generator operation by introducing a Power-base BMS (PBBMS) to maintain ship generator loads within the optimal 80–85% range. It manages real-time charging and discharging based on battery SOC (State of Charge) and SOH (State of Health) data, while incorporating a redundant cell replacement feature.

In electric propulsion and marine power systems, generators often operate at low loads, leading to reduced energy efficiency and uneconomical operation. Furthermore, excessive carbon dioxide emissions during port entry and departure have been a persistent challenge.

This technology places a PBBMS circuit between the battery and the LCS, discharging the battery when the generator load exceeds 85% and charging it when it falls below 80% to maintain a steady 80–85% load. Additionally, it stores cell-specific SOC in an EEPROM and uses a relay control module to automatically replace faulty cells with redundant cells. Applicable to hybrid propulsion ships, harbor vessels, and offshore plant power systems, it minimizes the number of active generators, thereby reducing both carbon emissions and fuel consumption during port operations.

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Key Features:

• PBBMS circuit unit positioned between the battery and LCS to measure, update, and store SOC and SOH information for all battery cells
• PMS generator management unit that sequentially operates multiple generators based on maintaining a stable 80–85% load factor for each unit
• Battery control circuit unit with built-in EEPROM, integrated into each battery module to update and store SOC information for individual cells
• Battery relay module that identifies faulty cells via voltage checks and automatically switches them with redundant cells

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This invention was developed with support from the Ministry of Education for the development of power systems for green aids to navigation.

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