Dual-Battery EV Control Using SOH-Based Power Allocation
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Solution Overview
Problem
In electric vehicles with dual batteries, imbalances in battery state of health (SOH) occur due to uneven usage on specific roads and external charging, leading to deviations in durability and performance.
Innovation Solution
An efficient operating strategy for dual batteries is implemented, dividing operating areas based on SOH and using a second high-voltage battery that can be added or separated from the power system, with a controller adjusting power supply and charging to balance battery usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a single high-voltage battery is used in an electric vehicle, then the vehicle can operate with a simple power system, but the driving range per charge becomes insufficient
Solution Approach 1:
The power system is segmented into a first high-voltage battery and a second high-voltage battery, allowing the vehicle to extend its driving range by utilizing both batteries while maintaining operational simplicity through coordinated control
2Length of moving object
If dual batteries are used to extend driving range, then the driving range per charge increases, but imbalance in battery usage occurs leading to deviation in states of health
Solution Approach 1:
The controller dynamically adjusts the operating areas and power distribution between the two batteries based on real-time state of health data, enabling adaptive balancing that prevents degradation imbalance while maintaining extended driving range capability
Solution Approach 2:
The system implements feedback control by continuously monitoring the state of health of both batteries and using this information to adjust power distribution strategies, ensuring that the second battery does not degrade significantly faster than the first battery
3Stability of the object's composition
If the second high-voltage battery is fixedly mounted to supply power, then the power system is stable, but the system lacks flexibility for different operating conditions
Solution Approach 1:
The operating areas for the first and second batteries are defined dynamically based on state of health references, allowing the system to adapt power distribution to different operating conditions while maintaining overall system stability through coordinated control
Data Source
AI summary
An electric vehicle includes a plurality of wheels, a driving motor configured to supply power to the plurality of wheels, and a controller configured to at least control one of power supply to the driving motor or charging by the driving motor. The controller is configured to: divide a plurality of operating areas based on references determined using states of health (SOHs) of a first battery and a second battery; determine between one of the first battery and the second battery based on an operating area in which an operating point of the driving motor is disposed among the plurality of operating areas; and control at least one of the power supply or the charging by using the determined battery.