Dual Battery Controller With Series-Parallel Switching for EV Power Demand
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Solution Overview
Problem
Conventional single battery packs for electric vehicles struggle to balance maximum output power and driving range across various driving scenarios, such as low-speed, high-speed, or uphill drives, as they are limited by the output voltage of either high-energy or high-power batteries.
Innovation Solution
A dual battery power management system that switches between series and parallel modes using a battery controller with a DC-DC converter and series-parallel switch, allowing the system to optimize output voltage and current based on electrical requirements, thereby enhancing power delivery and range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single battery pack is used, then the device complexity is reduced, but the adaptability to different driving scenarios (low-speed, high-speed, uphill) deteriorates because it cannot simultaneously provide maximum output power and driving range
Solution Approach 1:
The battery system is segmented into two distinct battery packs: a high-energy battery pack for extending driving range and a high-power battery pack for providing maximum output power. This segmentation allows each battery to be optimized for its specific function, enabling the system to adapt to different driving scenarios (low-speed, high-speed, uphill) while maintaining manageable complexity through specialized modular design
2Adaptability or versatility
If the battery system switches between series and parallel modes, then the adaptability to different driving scenarios is improved, but stepwise variations in voltage occur during mode transitions
Solution Approach 1:
A dual-mode DC-DC converter is introduced as an intermediary component between the battery packs and the load. This converter smoothly transitions between series and parallel connection modes while maintaining stable output voltage, eliminating the stepwise voltage variations that would otherwise occur during mode switching. The DC-DC converter acts as a buffer that decouples the abrupt structural changes from the output voltage, ensuring continuous and stable power delivery
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
The system effectively adjusts output voltage and current to meet the demands of different driving scenarios, improving motor performance and efficiency by providing increased power or torque as needed, while avoiding stepwise variations in voltage.
Implementation Method 1
The DC-DC converter is employed for receiving a first input voltage provided by the first battery and converting the first input voltage into a converted DC voltage
Implementation Method 2
a first battery and a second battery... The first battery is electrically connected to the DC-DC converter, for providing a first input voltage
Data Source
AI summary
A dual battery power management system, its battery controller and method for controlling the same have been provided. The dual battery power management system includes a load module, a battery controller, a first battery and a second battery. The battery controller is electrically connected to the load module for receiving an electrical requirement demanded by the load module. The battery controller is provided with a DC-DC converter and a serial-parallel switch. The first battery is employed to provide a first input voltage which is converted to a converted DC voltage by the DC-DC converter. The second battery is electrically connected to the serial-parallel switch and is used to provide a second input voltage. Upon the aforementioned electrical requirement, the battery controller controls the series-parallel switch to be operated at a serial mode or a parallel mode.