Dual-Battery EV Charging Control for Add-On Mobility Range Planning
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Solution Overview
Problem
Existing electric vehicles often rely on a single high-voltage battery for power, which may not be sufficient for long journeys, and lack efficient methods for planning and executing charging sessions.
Innovation Solution
The method involves a controller in the electric vehicle determining whether a second battery is connected to the first battery, identifying charging stations along the route to a destination, and providing users with charging planning information through a user interface, allowing for optimal charging strategies based on battery state and route conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a single high-voltage battery is used in the electric vehicle, then the vehicle structure is simple and cost is reduced, but the driving range is insufficient for long journeys
Solution Approach 1:
The battery system is segmented into a first battery (main battery) and a second battery (add-on battery). The first battery is fixedly mounted on the vehicle body, while the second battery is mounted on an add-on mobility apparatus that can be connected or disconnected. This segmentation allows the vehicle to operate with a single battery for short trips while enabling extended range through the optional second battery for long journeys, thus resolving the contradiction between driving range and system complexity.
2Length of moving object
If a second battery is added to extend driving range, then the driving range is increased, but the charging planning complexity increases
Solution Approach 1:
The controller automatically performs charging planning for both the first and second batteries without requiring manual user input. The system self-determines charging stations, charging timing, and power allocation based on the vehicle's route, battery states of charge, and power consumption characteristics. This automation resolves the contradiction by handling the increased charging planning complexity through intelligent self-management rather than user intervention.
Solution Approach 2:
The controller dynamically adjusts charging parameters including power allocation between batteries, charging voltage and current, and charging timing based on real-time conditions such as battery states of charge, route characteristics, and vehicle power consumption. This dynamic parameter adjustment enables efficient charging planning for the dual-battery system, resolving the complexity issue while maintaining extended driving range capability.
3Power
If the second battery is electrically connected to the first battery, then the power capacity is increased, but the connection reliability and safety requirements increase
Solution Approach 1:
A DC-DC converter is introduced as an intermediary device between the first battery and the second battery. The DC-DC converter manages the electrical connection, controls power flow, and provides isolation between the two battery systems. This intermediary component enhances connection reliability by providing controlled and protected electrical interfacing, while enabling the power capacities of both batteries to be combined for extended range operation.
Data Source
AI summary
A method for an electric vehicle involves a controller determining if a second battery is connected to a first battery via a connector. If so, it identifies charging stations near the electric vehicle's destination and outputs charging plans through a user interface. The charging plans may include recommended charging stations. Users may then use the user interface to input commands for executing the charging plans during driving.