Battery State Detection Device for Accurate Permissible Current
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Solution Overview
Problem
Conventional methods struggle to accurately detect the permissible charging and discharging currents of a battery due to the inability to simultaneously calculate real-time internal resistance values during charging and discharging, as batteries cannot perform both processes simultaneously.
Innovation Solution
A battery state detection device that includes a first permissible current calculating unit for calculating a permissible current based on battery voltage, a second unit for calculating without using voltage, and a determining unit to determine the permissible current based on both, allowing for accurate current detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If internal resistance value is calculated using battery voltage detection result, then measurement precision of permissible current is improved, but device complexity increases and real-time calculation for both charging and discharging becomes impossible
Solution Approach 1:
The patent divides the permissible current calculation into two independent pathways: a first calculation unit that uses battery voltage detection results to calculate permissible current with high accuracy, and a second calculation unit that calculates permissible current without using voltage detection results. This segmentation allows the system to overcome the limitation of not being able to simultaneously calculate internal resistance for both charging and discharging by providing alternative calculation methods for different scenarios.
Solution Approach 2:
The patent pre-stores multiple permissible current calculation formulas in the storage unit, including formulas that use voltage detection results and formulas that do not use voltage detection results. By preparing these calculation pathways in advance, the system can quickly select and execute the appropriate formula based on whether the battery is charging or discharging, eliminating the need for complex real-time internal resistance calculations for both states simultaneously.
2Measurement precision
If real-time internal resistance calculation is performed for both charging and discharging, then permissible current detection accuracy is improved, but it becomes impossible to calculate both values simultaneously since battery cannot perform both operations at the same time
Solution Approach 1:
The patent creates a universal permissible current calculation system that can handle both charging and discharging operations through a single integrated structure. The battery control device includes multiple permissible current calculation units and a selection unit that automatically chooses the appropriate calculation method based on the battery's operational state. This universal design eliminates the need for separate calculation systems for charging and discharging, simplifying the overall operation while maintaining high accuracy for both modes.
Solution Approach 2:
The patent changes the calculation parameters dynamically based on the battery's operational state. When the battery is charging, the system uses calculation formulas that are optimized for charging scenarios; when discharging, it switches to formulas optimized for discharging. This parameter change approach allows accurate permissible current detection for both operations without requiring simultaneous real-time internal resistance calculations, thereby simplifying the calculation operation.
3Device complexity
If conventional single-method permissible current calculation is used, then device complexity is reduced, but measurement precision of permissible current deteriorates
Solution Approach 1:
The patent introduces a selection unit as an intermediary between the multiple permissible current calculation units and the output. This selection unit acts as a mediator that receives calculation results from different pathways (using voltage detection or not using voltage detection) and selects the most appropriate result based on the current battery state. This intermediary structure allows the system to maintain low complexity by using a simple selection mechanism rather than complex integrated calculations, while still achieving high measurement precision through selective use of optimal calculation methods.
Data Source
AI summary
A battery state detection device detects a battery state and includes: a first permissible current calculating unit configured to calculate a first permissible current of a battery based on a voltage of the battery detected by a voltage detecting unit; a second permissible current calculating unit configured to calculate a second permissible current of the battery without using the voltage of the battery; and a permissible current determining unit configured to determine a permissible current of the battery corresponding to the battery state on the basis of at least one of the first permissible current and the second permissible current.