Battery Control Circuit Power Switching to Prevent Over-Discharge
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Solution Overview
Problem
Existing electricity storage devices face issues with continuous power consumption by battery control circuits when not in use, leading to discharge and voltage decrease, which affects the maintenance of a normal operating state.
Innovation Solution
A power supply method that switches between commercial power and battery power to the control circuit using a connection detector and discharge-stop determination unit, ensuring stable power supply without over-discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery module supplies operating electric power to the battery assembly control circuit continuously, then the control circuit can operate at predetermined time intervals to detect remaining capacity, but the battery becomes over-discharged due to dark current consumption
Solution Approach 1:
The control circuit operates at predetermined time intervals rather than continuously, performing detection functions periodically while remaining in a low-power state between intervals. This periodic operation reduces dark current consumption and prevents battery over-discharge while maintaining the ability to monitor battery status.
2Ease of operation
If the power supply circuit supplies operating electric power from the battery to the control circuit, then the control circuit can function, but the battery voltage decreases and prevents a normal operating state from being maintained
Solution Approach 1:
A power conversion device is introduced as an intermediary between the battery module and the control circuit. This device converts battery voltage to a stable output voltage suitable for the control circuit, isolating the control circuit from battery voltage fluctuations and preventing operational disruptions due to voltage changes.
3Measurement precision
If the control circuit operates continuously to detect remaining capacity, then monitoring accuracy is maintained, but electric power is consumed even when the battery module is not discharged
Solution Approach 1:
The control circuit performs remaining capacity detection at predetermined time intervals rather than continuously. This periodic measurement approach maintains adequate monitoring capability while significantly reducing power consumption during periods when the battery module is not actively discharging.
Data Source
AI summary
Operating electric power is preferably supplied to a battery assembly control circuit from both a power converting device and a battery module. An electricity storage device includes a battery module including battery cells and a battery assembly control circuit, and a power converting device configured to charge the battery module with a commercial power supply and to supply electric power to a load. The power converting device supplies electric power to the battery assembly control circuit while an output voltage of the power converting device is higher than a predetermined voltage. The battery module starts to supply operating electric power to the battery assembly control circuit upon detecting that the electric power from the power converting device starts to be supplied to the battery assembly control circuit. The battery module stops supplying the electric power to the battery assembly control circuit when the battery module stops being discharged.