Dual Battery EV Power System with Boost Stage
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Solution Overview
Problem
Electric vehicles face limitations in power delivery, particularly in hilly areas or off-road conditions due to underpowered electric motors, which restrict their range and usability, necessitating technological advances for improved efficiency.
Innovation Solution
A power delivery system incorporating an auxiliary boost stage and an on-board charging circuit, where a main battery supplies power under normal load conditions and an auxiliary boost battery provides high-level current when needed, allowing the vehicle to operate in high-performance mode, with a low-cost DC/DC converter for charging and charge-balancing between batteries of different chemistries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a single main battery is used to power the electric motor, then the vehicle can operate under normal load conditions, but the vehicle lacks sufficient power for high-performance operation in hilly areas or off-road conditions
Solution Approach 1:
The battery system is segmented into two distinct batteries: a main battery for normal operation and a boost battery for high-performance operation. This segmentation allows each battery to be optimized for its specific function, with the boost battery providing high-power bursts when needed while the main battery handles sustained normal loads, thereby resolving the power deficiency without requiring a single oversized complex battery system
2Power
If a boost battery is added to provide high-level current, then the vehicle can operate in high-performance mode, but the system complexity increases with additional charging circuits
Solution Approach 1:
The DC/DC converter is designed with multi-functionality, serving both as a charging circuit for the boost battery and as a power management component for the dual-battery system. This universal component handles multiple tasks including charging the boost battery from the main battery, managing power flow between batteries, and providing charge-balancing functions, thereby reducing overall system complexity despite the addition of the boost battery
3Power
If batteries with different chemistries are used for main and boost, then the power delivery is optimized, but charge management becomes more difficult
Solution Approach 1:
The DC/DC converter incorporates charge-balancing functionality that uses feedback mechanisms to monitor and adjust the charging process. The system continuously monitors the charge states of both batteries and dynamically adjusts charging parameters to maintain optimal charge balance, accounting for the different chemistry characteristics of the main and boost batteries. This feedback-based approach enables effective management of different battery chemistries without requiring complex manual intervention
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances the driving range and power management of electric vehicles, enabling efficient continuous or intermittent high-performance operation, particularly benefiting personal transport vehicles like scooters or motorbikes by extending their range and usability in challenging terrains.
Implementation Method 1
a charging circuit that includes a low-cost DC/DC converter
Data Source
AI summary
A power delivery system for an electric vehicle provides efficient power management for either continuous or intermittent high-performance operation, using a boost stage and an on-board charging circuit. A main battery, configured as a high-capacity power source, supplies power to the electric motor under normal load conditions. An auxiliary boost battery assists the main battery in supplying a high-level current at a higher discharge rate thereby causing the motor to operate in a high-performance drive mode. A charging circuit recharges the boost battery from the main battery during operation of the motor. The charging circuit also maintains a charge balance between the boost battery and the main battery when the two batteries have different chemistries. In one embodiment, participation of the boost battery in powering the electric motor can be controlled automatically according to sensed changes in the load. In another embodiment, power management can be based on timed intervals.