Battery Control Device Voltage-Based Power Restriction
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Solution Overview
Problem
Existing battery control systems face challenges in accurately managing the inter-terminal voltage of individual cells within a battery pack, leading to potential overcharging or overdischarging due to temperature sensor placement inaccuracies and complex state of charge management, resulting in increased costs and inefficiencies.
Innovation Solution
A battery control apparatus that monitors and controls the state of each single cell within a battery pack by adjusting the permitted charge and discharge powers based on pre-defined voltage ranges, using a single cell management part, voltage detection, and storage of power tables to ensure inter-terminal voltage remains within safe limits, simplifying the control process and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature sensor is disposed to detect temperature for controlling charge/discharge power, then temperature-based power control can be implemented, but the detected temperature may not accurately correspond to the actual temperature of each single cell due to sensor placement issues
Solution Approach 1:
The patent replaces the mechanical/physical temperature sensor placement system with an electrical measurement system. Instead of relying on temperature sensors that require precise physical placement, the invention uses voltage detection circuits to measure the inter-terminal voltage of each single cell, which directly reflects the cell's state without requiring external sensor placement. This substitution eliminates the measurement accuracy issues associated with temperature sensor positioning.
2Manufacturing precision
If charging and discharging control is performed for each single cell to maintain voltage within permitted range, then voltage control precision is improved, but control process complexity and cost increase
Solution Approach 1:
The patent merges the control of multiple single cells into a unified battery pack-level control strategy. Instead of independently controlling each single cell's charge/discharge power, the invention detects the inter-terminal voltage of each cell and adjusts the overall battery pack's charge/discharge power to ensure all cells remain within their permitted voltage ranges. This consolidation reduces control complexity while maintaining voltage control precision through coordinated pack-level management.
Solution Approach 2:
The patent implements preliminary action by pre-defining the permitted voltage range for each single cell before operation. These voltage thresholds are stored in advance, and the control system uses them to proactively adjust charge/discharge power before voltage violations occur. This preventive approach simplifies real-time control decisions compared to reactive correction methods.
3Device complexity
If maximum charge power is determined using maximum cell voltage value and maximum discharge power using minimum cell voltage value, then power control is simplified, but the control may not optimally account for temperature variations among cells
Solution Approach 1:
The patent applies local quality by considering the specific voltage characteristics of each individual cell within the battery pack. Instead of using a single average voltage or simplified maximum/minimum values for the entire pack, the invention detects and evaluates the inter-terminal voltage of each single cell individually. This cell-specific approach ensures that temperature variations and other local differences among cells are properly accounted for in the control decisions.
Data Source
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AI summary
A battery control apparatus is provided which can keep an inter-terminal voltage of each single cell within a permitted range while permitted power is controlled in units of a battery pack. The battery control apparatus of the invention restricts the permitted power of the battery pack according to a degree of closeness of a close circuit voltage of the single cell to an upper limit or a lower limit of the permitted range.