Single DCDC Converter Power Management for Dual Battery Packs
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Solution Overview
Problem
Existing power supply strategies for new energy vehicles are inefficient and inflexible, as they rely on multiple DCDC converters to change output voltage, leading to energy inefficiency and limited power management between battery packs.
Innovation Solution
A control method and system that uses a single DCDC converter to manage power between two battery packs, adjusting energy transmission based on capacity parameters to optimize power distribution and balance load demands, especially when a vehicle is in a parking or driving state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple DCDC converters are used to change output voltage, then voltage conversion capability is improved, but device complexity and energy loss increase
Solution Approach 1:
The patent merges multiple DCDC converter functions into a single DCDC converter by adding a switch module that can connect different battery packs to the same converter. This allows one converter to handle voltage conversion for multiple battery packs sequentially, reducing the total number of converters while maintaining voltage conversion capability for different voltage requirements
Solution Approach 2:
The single DCDC converter is designed to serve multiple functions by being able to convert voltage from different battery packs (first battery pack and second battery pack) to different output voltages (12V or 48V) through the switch module. This multi-functional design eliminates the need for separate converters for each battery pack and voltage level
2Adaptability or versatility
If multiple DCDC converters are used to change output voltage, then voltage conversion capability is improved, but energy loss increases
Solution Approach 1:
By merging multiple converter functions into one, the patent reduces the total number of energy conversion stages. Each additional DCDC converter represents an energy loss opportunity; consolidating to one converter means only one conversion stage is needed at any time, significantly reducing cumulative energy losses from multiple converters operating simultaneously
3Device complexity
If battery packs operate independently, then system simplicity is improved, but power management flexibility deteriorates
Solution Approach 1:
The patent introduces dynamic switching capability through the switch module, which can dynamically reconfigure which battery pack connects to the DCDC converter based on real-time conditions such as battery capacity, load requirements, and vehicle operating state. This dynamic reconfiguration enables flexible power management while keeping the overall system structure relatively simple
Solution Approach 2:
The control module monitors the states of both battery packs and uses this feedback information to intelligently decide which battery pack should supply power to the load or receive charge from the DCDC converter. This feedback mechanism enables flexible power distribution strategies such as balancing battery states of charge or prioritizing certain battery packs based on their health and capacity
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 approach enhances the flexibility and efficiency of the power supply by dynamically balancing energy between battery packs, improving power utilization and reducing energy loss, thus enhancing the overall power management system.
Implementation Method 1
controlling a direct current converter to transmit electric energy of the second battery pack to the first battery pack
Data Source
AI summary
The embodiments of the present application provide a power supply apparatus, a battery management system, a power supply system, a control method and a medium. The method includes: controlling, under a condition that a vehicle is in a parking state, a first battery pack of a power supply apparatus to supply power to a first load of the vehicle, and controlling the first battery pack and a second battery pack of the power supply apparatus to stop supplying power to a second load of the vehicle; acquiring, in a process of supplying power to the first load, a capacity parameter of the first battery pack; controlling, under a condition that the capacity parameter of the first battery pack is lower than a first preset capacity threshold, a direct current converter to transmit electric energy of the second battery pack to the first battery pack.