Golf Cart Battery Control Module Single Relay Switching
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Solution Overview
Problem
Current battery management systems for lithium batteries face challenges in accurately monitoring state of charge due to non-linear discharge profiles, leading to potential overcharging or undercharging, which can result in permanent capacity loss and require complex, expensive components for protection.
Innovation Solution
An automatic rechargeable battery control module that automatically switches between charging and discharging modes based on state of charge thresholds, using a microprocessor and sensors to monitor voltage and temperature, and incorporates a low voltage disconnect to prevent damage from over-discharging, while simplifying operations by eliminating the need for manual switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current battery management systems use two relays or contactors with manual reset for over-charge and under-charge protection, then protection reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines two separate relays into a single relay contactor that performs both over-charge and under-charge protection functions. The single relay replaces the traditional two-relay configuration, reducing component count while maintaining protection capabilities through automated control logic that switches the relay between charging and discharging modes based on battery state of charge thresholds.
Solution Approach 2:
The system implements automated mode switching that eliminates the need for manual reset operations. The control system automatically detects battery state of charge levels and switches the relay contactor between charging and discharging modes without requiring user intervention, making the system self-managing and reducing operational complexity.
2Quantity of substance
If lithium batteries use non-linear discharge profiles, then energy capacity is improved, but measurement precision of state of charge deteriorates
Solution Approach 1:
The system continuously monitors battery voltage and compares it against predetermined thresholds to determine state of charge levels. The control system uses feedback from voltage measurements to automatically switch between charging and discharging modes, ensuring accurate state of charge management despite the non-linear discharge characteristics of lithium batteries.
3Ease of operation
If automatic control system is implemented for mode switching, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The control system automatically monitors battery state of charge and switches between charging and discharging modes without requiring manual user input. The system self-manages the entire operation by detecting voltage thresholds and controlling the relay contactor accordingly, eliminating the need for manual switching while keeping the control logic straightforward and threshold-based.
Data Source
AI summary
An automatic rechargeable battery control module for a vehicle, such as a golf cart incorporates an automatic battery control system that automatically switches from charge to discharge modes with a single relay, thereby preventing the need to manually reset a relay switch due to an over or under voltage situation. An automatic battery control circuit is coupled with a battery management system and a relay contactor is opened and closed by a signal from the battery management system. The battery management system monitors a state of charge of the battery unit as well as current flow to and from a battery unit. The automatic rechargeable battery control module may have a state of charge output that is connected with a state of charge indicator to inform a driver of an approximate driving range or time remaining.