Synchronized Balance Correction Device for Battery Voltage Equalization
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Solution Overview
Problem
In power storage devices, unsynchronized control signals for switching elements in balance correction circuits can lead to issues such as disturbance, noise, and abnormal oscillations, affecting the equalization of voltages in series-connected power storage cells.
Innovation Solution
A balance correction device with a timing signal supply unit that provides a common timing signal to switching control units across multiple balance correction units, ensuring synchronized control signals for equalizing voltages in power storage cells, thereby preventing issues caused by unsynchronized signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple independent control circuits are used to control switching elements in balance correction units, then the balance correction function can be implemented across multiple power storage modules, but the control signals may become unsynchronized causing disturbance, noise, and abnormal oscillations
Solution Approach 1:
The patent merges the timing signal generation function into a single centralized timing signal supply unit that provides synchronized timing signals to all balance correction units. This centralization ensures that all switching elements across multiple power storage modules operate in synchronization, eliminating the disturbance, noise, and oscillation problems caused by unsynchronized independent control circuits.
Solution Approach 2:
The timing signal supply unit acts as an intermediary between the control system and the switching elements. It receives a master timing signal and distributes synchronized timing signals to all balance correction units, ensuring coordinated operation without direct interconnection between independent control circuits.
2Reliability
If a single centralized control circuit is used to control all switching elements, then control signal synchronization is ensured, but the device complexity and control burden increase
Solution Approach 1:
The control system is segmented into modular balance correction units, each with its own switching elements and local control logic. The timing signal supply unit provides synchronized timing signals to these modular units, allowing each unit to operate independently while maintaining overall synchronization. This segmentation reduces the control burden compared to a fully centralized approach.
Solution Approach 2:
The timing signal supply unit serves multiple functions: it generates timing signals, distributes them to all balance correction units, and ensures synchronization across the entire system. This multi-functionality consolidates control responsibilities and reduces overall system complexity.
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 effectively synchronizes control signals, preventing disturbances and noise, and ensuring stable voltage equalization across power storage cells, enhancing the reliability and efficiency of the balance correction process.
Implementation Method 1
an inductor that has one end L1 connected to a connection point between a first one of the power storage modules and a second one of the power storage modules connected in series
Data Source
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AI summary
In a balance correction circuit 1 including a plurality of converter type balance correction units that control a supply of a current to a plurality of power storage cells by complementarily on/off controlling two switching elements and hereby allowing to exchange power between or among power storage cells via an inductor to equalize the voltages of the power storage cells, a common timing signal used to generate a control signal of a switching element is supplied to each of the above balance correction units. For example, the balance correction circuit 1 generates a timing signal to supply to a first balance correction unit based on a variation in a voltage applied to the capacitive element charged by a voltage difference created between a control signal generated by the second balance correction unit and a second power storage cell cathode of the balance correction unit.