Parallel Battery Connection Control for Vehicle Power Supply
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Solution Overview
Problem
Connecting multiple batteries in parallel to a vehicle's object device can lead to malfunctions and potential damage due to voltage differences between the batteries.
Innovation Solution
A vehicle system that connects first and second power storage devices in parallel, with a control mechanism to ensure the voltage difference between batteries is within a reference value before allowing connection to the object device, using SMRs to manage the connection state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple batteries are connected in parallel to one object device to supply large amount of power, then power supply capacity is improved, but voltage difference between batteries may cause malfunction and damage to the object device
Solution Approach 1:
The control device checks the voltage difference between batteries before connecting them to the object device. This preliminary verification prevents malfunction by ensuring that only batteries with compatible voltages (within the reference value) are connected together, thereby maintaining system reliability while enabling parallel connection for enhanced power capacity.
2Ease of operation
If voltage difference between batteries is not controlled, then connection simplicity is maintained, but overcurrent may occur causing damage to the object device
Solution Approach 1:
The control device continuously monitors the voltage difference between connected batteries and uses this feedback information to control the connection state. When the voltage difference exceeds the reference value, the control device prevents connection or disconnects batteries, thereby preventing overcurrent and potential damage while maintaining operational simplicity through automated control.
3Device complexity
If batteries are connected without voltage verification, then system complexity is reduced, but malfunction occurrence increases
Solution Approach 1:
The control device automatically performs voltage difference verification and manages battery connection/disconnection without requiring manual intervention. This self-service approach maintains relatively simple system architecture while significantly improving reliability, as the control device autonomously prevents malfunction by ensuring only compatible batteries are connected in parallel.
Data Source
AI summary
The vehicle includes an object device and a first power storage device and a second power storage device that can be connected in parallel to the object device. The first power storage device includes a first battery. The second power storage device includes a second battery. When a voltage difference between a voltage of the first battery and a voltage of the second battery is greater than a reference value, at least one of the first battery and the second battery is not connected to the object device.