Voltage Balance Correction Circuit for Scalable Battery Packs
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Solution Overview
Problem
Existing voltage balance correction circuits for series-connected electricity storage cells have low versatility and scalability due to complex configurations requiring individual design and production, making it difficult to add or remove cells and scale the system flexibly.
Innovation Solution
A voltage balance correction circuit with multiple voltage correction circuits, each comprising a first coil connected in parallel to an electricity storage cell and a magnetically coupled second coil, where switches control the connection to equalize voltages by alternating ON/OFF states for high-voltage cells and maintaining a rectified state for low-voltage cells, allowing for parallel connection of second coils for easy scalability and versatility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple coils are wound around a single core in existing voltage balance correction circuits, then voltage equalization can be achieved, but the configuration has low versatility and scalability requiring individual design and production for each cell count
Solution Approach 1:
The patent divides the voltage balance correction function into multiple independent correction circuits, each handling a subset of battery cells. Instead of using one large transformer core with multiple coils, the invention uses multiple smaller transformer cores with fewer coils each, allowing independent design and assembly. This segmentation enables flexible configuration for different numbers of battery cells while maintaining effective voltage equalization across all cells.
2Reliability
If multiple coils are wound around a single core in existing voltage balance correction circuits, then voltage equalization can be achieved, but the configuration is difficult to add or remove electricity storage cells later
Solution Approach 1:
By segmenting the voltage balance correction system into multiple independent circuits with fewer coils per core, the patent enables modular expansion. When additional battery cells need to be added, new correction circuits can be independently designed and integrated without redesigning the entire system, significantly improving ease of manufacture and flexibility.
Solution Approach 2:
The patent creates universal building blocks (correction circuits with standardized transformer cores and coils) that can serve multiple functions and be configured for different numbers of battery cells. This multi-functionality allows the same basic circuit design to be used across various system scales, from small to large battery packs.
3Reliability
If a large number of coils are wound around a single core, then voltage balance correction can be performed, but the design and production must be done individually according to the number of electricity storage cells
Solution Approach 1:
The patent reduces design complexity by dividing the correction function into multiple identical or similar smaller circuits. Each circuit uses fewer coils on smaller cores, standardizing the design process. This allows reuse of proven designs and simplifies production planning, as the same manufacturing processes can be applied across multiple identical circuit modules.
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 enables high versatility and scalability by simplifying the design and production process, allowing for easy addition or removal of electricity storage cells and efficient voltage equalization, reducing unnecessary charging and discharging, and achieving precise voltage balancing.
Implementation Method 1
a second coil magnetically coupled with the first coil
Data Source
AI summary
A voltage balance correction circuit includes multiple voltage correction circuits that correspond one-to-one to multiple electricity storage cells connected in series, and a control circuit that is configured to control the multiple voltage correction circuits based on voltages of the multiple electricity storage cells. The multiple voltage correction circuits include first coils that are connected to the electricity storage cells in parallel, respectively, field-effect transistors that are configured to turns on/off connections of the first coils with the electricity storage cells, respectively, under control of the control circuit, and second coils that are magnetically respectively coupled with the first coils. In the multiple voltage correction circuits, the second coils are connected in parallel.