Secondary Cell Control System Voltage Balance Energy Loss
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Solution Overview
Problem
Existing cell balance control methods in secondary cell assemblies, such as lithium ion cells, result in significant energy loss due to excessive discharging or charging of cells with higher or lower voltages, leading to inefficient energy management.
Innovation Solution
A secondary cell control system with separate charging and discharging circuit sections, each connected to multiple cells, allows for selective charging and discharging based on cell voltage thresholds, reducing energy loss by optimizing the number of cells charged or discharged and using switches to manage connections efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If discharging method is used to control cell balance, then cell voltage uniformity is improved, but energy loss increases when many cells have low voltages
Solution Approach 1:
The invention segments the cell balance control process into two distinct operational modes: a first control mode that discharges cells with high voltage, and a second control mode that charges cells with low voltage. This segmentation allows the system to select the appropriate control method based on the specific voltage distribution state, thereby avoiding the energy loss associated with discharging when most cells already have low voltages.
Solution Approach 2:
The invention dynamically switches between different control modes based on real-time cell voltage conditions. A determination unit assesses the voltage distribution and selects either the first control mode (discharging high-voltage cells) or the second control mode (charging low-voltage cells), enabling adaptive energy-efficient balance control that responds to changing system states.
2Stability of the object's composition
If charging method is used to control cell balance, then cell voltage uniformity is improved, but energy loss increases when many cells have high voltages
Solution Approach 1:
The invention segments the cell balance control process into two distinct operational modes: a first control mode that discharges cells with high voltage, and a second control mode that charges cells with low voltage. This segmentation allows the system to select the appropriate control method based on the specific voltage distribution state, thereby avoiding the energy loss associated with charging when most cells already have high voltages.
Solution Approach 2:
The invention dynamically switches between different control modes based on real-time cell voltage conditions. A determination unit assesses the voltage distribution and selects either the first control mode (discharging high-voltage cells) or the second control mode (charging low-voltage cells), enabling adaptive energy-efficient balance control that responds to changing system states.
3Manufacturing precision
If separate charging and discharging circuits are provided for each cell, then cell balance control precision is improved, but device complexity increases
Solution Approach 1:
The invention merges multiple individual charging and discharging circuits into shared common charging and discharging circuits that can serve multiple cells. The control unit intelligently routes current to the appropriate cells based on their voltage conditions, achieving the same precise balance control as individual circuits would provide, while significantly reducing overall system complexity and component count.
Solution Approach 2:
The common charging and discharging circuits are designed to be multi-functional, capable of serving any cell in the assembly as needed. This universal design allows a single circuit to perform the functions that would otherwise require dedicated circuits for each cell, reducing complexity while maintaining control precision through intelligent switching and routing.
Data Source
AI summary
A secondary cell control system includes a plurality of cells; a charging circuit section and a discharging circuit section. The charging circuit section charges cells selected from among said plurality of cells, and the discharging circuit section discharges cells selected from among said plurality of cells.