Battery Storage System Shutdown Control via Discharge Switch
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Solution Overview
Problem
Existing storage systems cannot set discharging current to 0 in shutdown state, leading to battery capacity decrease and potential power deficiency, and fail to recover from shutdown state due to changing charging voltage requirements.
Innovation Solution
A storage system with a discharge control switch, detecting unit, controller, and control power-supply unit that automatically stops discharge when voltage or capacity falls below a threshold, and detects charging voltage input to restart charging, with a comparing unit adjusting voltage reference based on the number of connected batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the discharging current is decreased in the shutdown state, then the power supply duration is extended, but the discharging current cannot be set to 0 and battery capacity decreases over time
Solution Approach 1:
The patent extracts the detecting unit and control circuit from the main power supply system, providing them with a separate control power supply. This allows the detecting unit to remain powered during shutdown state to monitor battery voltage, while the main load receives no power, enabling the discharging current to be effectively set to 0 while maintaining detection capability
Solution Approach 2:
The control power supply unit acts as an intermediary between the battery and the detecting unit. It provides dedicated power to the detecting unit during shutdown state, enabling continuous monitoring without consuming significant battery capacity, thus resolving the contradiction between extending power supply duration and retaining battery capacity
2Reliability
If the discharging current is set to 0 in the shutdown state, then battery capacity is preserved, but the system cannot detect charging voltage input to restart charging
Solution Approach 1:
The control power supply unit serves as an intermediary that enables the detecting unit to remain operational during shutdown state. It provides minimal power to the detecting unit, allowing continuous monitoring of battery voltage and detection of charging voltage input, thus enabling recovery from shutdown state while preserving battery capacity
Solution Approach 2:
The detecting unit continuously monitors battery voltage using power from the control power supply, enabling the system to automatically detect when charging voltage is applied and autonomously restart the charging process without external intervention, achieving self-service recovery from shutdown state
3Adaptability or versatility
If the number of connected batteries changes, then the minimum required charging voltage changes, but the system cannot adapt to voltage changes
Solution Approach 1:
The patent implements dynamic adaptation by enabling the detecting unit to continuously monitor battery voltage and automatically adjust its detection threshold based on the actual number of connected batteries. This dynamic response allows the system to adapt to changing voltage requirements without requiring complex pre-programming or manual configuration
Solution Approach 2:
The detecting unit provides continuous feedback on battery voltage levels to the control system. When the number of connected batteries changes, the feedback mechanism enables the system to detect the voltage change and adjust the minimum required charging voltage threshold accordingly, achieving adaptability through feedback-driven control
Data Source
AI summary
Discharge is stopped when a voltage of a battery becomes smaller than a defined value or a remaining capacity of the battery reaches 0, and further, when power to a system cannot be maintained, the system is automatically shut down to be put into a shutdown state. When it is determined that the voltage of the battery or an SOC from a battery monitor 11 is smaller than the defined value, a discharge control switch 22 is turned off. A voltage Vx corresponding to a voltage between terminals T1 and T2 is input to an A/D port of a controller 21 and a value thereof is monitored. When it is determined that the voltage Vx input to the A/D port is smaller than a defined value, the controller 21 turns off a switch circuit 12 to turn off power to the battery monitor 11.