Battery Array Balancing Circuit with Time-Division Multiplexing
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Solution Overview
Problem
Current battery management systems struggle to integrate multiple functions, such as parameter sensing, active balancing, and passive balancing, into a single integrated circuit chip due to complex hardware structures, leading to increased costs and reduced integration degrees.
Innovation Solution
A battery array management system utilizing a switch array for time-division multiplexing, an optimized DC-DC converter, and a control unit to perform active and passive balancing operations, simplifying the hardware structure and improving integration by using a Schottky diode and MOS transistor synchronous rectification circuit for efficient charging and discharging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If complex hardware structure is used to achieve multiple functions, then functionality improves, but manufacturing cost increases
Solution Approach 1:
By merging multiple functions into a single chip, the patent reduces the total component count and assembly requirements. The integrated circuit chip encompasses sensing, control, and power conversion functions that would otherwise require separate components, thereby reducing manufacturing complexity and cost while maintaining full functionality.
Solution Approach 2:
The patent uses standard integrated circuit fabrication processes to replicate the complex functionality across multiple chips. By designing a standardized chip architecture that can be mass-produced using established semiconductor manufacturing techniques, the system achieves cost-effective production despite the sophisticated functions integrated into each chip.
2Productivity
If Schottky diode and MOS transistor synchronous rectification circuit is used, then charging efficiency improves, but device complexity increases
Solution Approach 1:
The Schottky diode and MOS transistor synchronous rectification circuit are merged into a single integrated structure on the chip. This combination allows the circuit to leverage the low forward voltage drop of Schottky diodes while utilizing the low on-resistance of MOS transistors during synchronous rectification, achieving high charging efficiency without requiring separate discrete components for each function.
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 system achieves simplified hardware, reduced costs, and improved integration by enabling efficient parameter sensing and balancing operations, ensuring consistent battery states and extending battery array lifespan.
Implementation Method 1
a Schottky diode and a MOS transistor coupled to the Schottky diode... configured such that, when performing the active balancing of said battery unit, conduction of the MOS transistor is controlled by collecting voltage across the Schottky diode
Implementation Method 2
reducing the conduction voltage; when not performing the active balancing of said battery unit, the secondary-side synchronous rectification circuit enters a sleep state, thereby reducing power consumption and reducing loss of said battery unit
Data Source
AI summary
The invention relates to system and method for managing a battery array. The system comprises: a bus; a connecting unit coupled between the battery array and the bus; an active balancing unit for performing constant current charging of each battery unit connected to the bus through a DC-DC converter to achieve active balancing of said battery unit; a passive balancing unit for performing constant current discharging of each battery unit connected to the bus to perform passive balancing of said battery unit; a sensing unit for sensing battery parameters of each battery unit connected to the bus; and a control unit for controlling the connection unit to connect the plurality of battery units to the bus in turn, and the active balancing unit and the passive balancing unit, based on the sensed battery parameters of said battery unit connected to the bus, to perform balancing operations of said battery unit.