Battery Load Balancing Device Using Resonant Energy Transfer
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Solution Overview
Problem
Existing charge balancing devices for power batteries with electrochemical accumulators face inefficiencies, such as high energy consumption and long balancing times, particularly when dealing with significant imbalances between stages, and are costly due to the need for precise measurements and high component costs.
Innovation Solution
A load balancing device with a transformer and AC/DC converters that operates in step-level and constant-level modes, using a series resonant circuit and control circuit to optimize energy transfer between stages, reducing Joule effect losses and balancing time, while maintaining efficiency and cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If energy dissipation balancing systems are used to make voltage uniform across stages, then voltage uniformity is improved, but energy consumption increases significantly
Solution Approach 1:
The patent introduces a DC-DC converter as an intermediary device between the battery stages and the load. This converter actively manages power distribution by measuring individual stage voltages and dynamically adjusting current allocation, thereby achieving voltage uniformity without the excessive energy dissipation of traditional resistor-based balancing systems.
Solution Approach 2:
The system dynamically changes operating parameters (current allocation, switching frequencies) based on real-time voltage measurements. The DC-DC converter adjusts its operating parameters to optimize power distribution across stages, transitioning from static to adaptive parameter control to minimize energy loss while maintaining voltage uniformity.
2Reliability
If traditional balancing devices are used to charge multiple stages, then all stages can be charged, but balancing time increases significantly
Solution Approach 1:
The patent implements dynamic current allocation where the DC-DC converter continuously adjusts the current supplied to each stage based on its charge state. Instead of using fixed current values, the system dynamically modifies operating parameters to prioritize stages that need charging, thereby reducing overall balancing time while ensuring all stages reach full charge.
Solution Approach 2:
The system employs periodic measurement and adjustment cycles, continuously monitoring stage voltages and recalibrating current distribution at optimized intervals. This periodic control approach allows the system to respond to changing battery states efficiently, reducing the time required to achieve complete balancing across all stages.
3Measurement precision
If precise measurement and high component specifications are used in balancing devices, then measurement accuracy is improved, but device cost increases
Solution Approach 1:
The DC-DC converter is designed as a multi-functional device that performs voltage regulation, current distribution, measurement, and control functions in a single integrated system. By combining multiple functions into one device, the patent reduces the need for separate expensive components while maintaining high measurement precision through the converter's integrated sensing and control capabilities.
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 solution significantly reduces balancing times and energy consumption, optimizing energy transfer and maintaining high efficiency, even at low power levels, thereby enhancing the overall performance and reducing costs associated with balancing power batteries.
Implementation Method 1
a transformer (310)
Implementation Method 2
a series resonant circuit (340)
Data Source
Figure 1~3
Figure 4~5
Figure 6~7
AI summary
The invention relates to a device (3) for balancing the load of a storage device including a plurality of elements connected in series. Said device includes: a DC/AC converter (320) including an inverter and a series resonant circuit (340) connected to the output of the inverter; a plurality of AC/DC converters (301, 302, 303), each comprising an input and an output that is connected to one of said respective storage elements and selectively supplies power to the output thereof; a transformer (310), the main winding (311) of which is connected to the series resonant circuit (340) and the secondary winding (312) of which has outputs connected to an input of a respective AC/DC converter; and a control circuit (5) configured to control the DC/AC converter (320) at the current source when the number of outputs supplied with power is no higher than a threshold and moreover configured to control the DC/AC converter (320) at a constant power when the number of outputs supplied with power is greater than said threshold.