Resonance Voltage-Doubling Circuit for Battery Equalization
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Solution Overview
Problem
Large-scale electricity storage systems face significant challenges in voltage equalization due to temperature variations between modules, leading to complex circuit configurations and the need for numerous switches, which complicates the system and makes it difficult to achieve efficient voltage balancing across multiple electricity storage cells and modules.
Innovation Solution
A voltage equalization circuit system that eliminates the need for switches in electricity storage cell voltage equalization circuits by using a temporally changing input voltage from the electricity storage module voltage equalization circuit, incorporating multi-stage voltage-doubling rectifier circuits and resonance circuits to equalize voltages across multiple cells and modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If different voltage equalization circuits are applied inside each electricity storage module and between modules, then voltage equalization effectiveness is improved, but circuit configuration complexity increases due to requiring multiple switches
Solution Approach 1:
The patent merges the cell-level equalization function and module-level equalization function into a single integrated circuit. The series resonance voltage-doubling circuit can operate in two modes: when the switching element is activated, it performs module-level equalization; when the switching element is inactive, it performs cell-level equalization. This eliminates the need for separate circuits and multiple switches, resolving the contradiction between equalization effectiveness and circuit complexity.
Solution Approach 2:
The single series resonance voltage-doubling circuit is designed to perform multiple functions: it can equalize voltages between different electricity storage modules and simultaneously equalize voltages among cells within the same module. The circuit achieves this through a switching element that toggles between different operational states, allowing one circuit to replace what would traditionally require multiple dedicated circuits.
2Reliability
If a large number of switches are used for voltage equalization, then voltage balancing capability is improved, but the number of components increases leading to system complexity
Solution Approach 1:
The patent combines multiple equalization functions into a single series resonance voltage-doubling circuit that can operate in different modes. Instead of using multiple switches for cell-level equalization and module-level equalization separately, this single circuit with one switching element performs both functions, dramatically reducing the total number of components while maintaining comprehensive voltage balancing capability.
3Reliability
If traditional switched capacitor equalization circuits are used, then voltage equalization is achieved, but circuit configuration becomes significantly complicated with switches proportional to number of cells and modules
Solution Approach 1:
The patent replaces the traditional mechanical switching-based equalization approach with a series resonance voltage-doubling circuit. Instead of using multiple mechanical or electronic switches to transfer charge between cells and modules, the invention uses resonant oscillation and voltage doubling mechanisms to achieve equalization. This substitution of the equalization mechanism fundamentally reduces circuit complexity while maintaining effectiveness.
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 simplifies the circuit configuration by eliminating the need for switches in cell voltage equalization circuits, reducing the number of components and enhancing the overall efficiency of voltage balancing across the system, thereby addressing the complexity and inefficiency of existing systems.
Implementation Method 1
a resonance circuit configured to generate an alternating current voltage by receiving an input voltage that changes with time
Implementation Method 2
a multi-stage voltage-doubling rectifier circuit configured to equalize voltages of a plurality of electricity storage cells
Data Source
AI summary
An equalization circuit system having a system configuration simplified through reduction of the total number of switches is provided. An electricity storage cell voltage equalization circuit is operated with a square wave voltage generated at a switching node in an electricity storage module voltage equalization circuit as an input voltage, thereby achieving an electricity storage cell voltage equalization circuit without a switch. Typically, the electricity storage cell voltage equalization circuit may be a resonance voltage-doubling rectifier circuit, and the electricity storage module voltage equalization circuit may be a switched capacitor, a resonance voltage-doubling rectifier circuit, a buck-boost converter or the like.