Semiconductor Battery State Detection Using Voltage Current Correction
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Solution Overview
Problem
Existing techniques for monitoring the state of secondary batteries face challenges in accurately detecting Full Charge Capacity (FCC), Remaining Capacity (RC), and State of Charge (SOC) due to measurement errors, particularly in temperature information, which affects the accuracy of battery state detection and utilization.
Innovation Solution
A semiconductor device that measures battery voltage and current to calculate first and second estimate values of capacity, correcting the first estimate value based on the difference between the capacity values extracted at different discharge voltages, thereby improving the accuracy of battery state detection and utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature information is used to detect battery state (FCC, RC), then detection can be performed, but measurement errors in temperature cause errors in detection accuracy
Solution Approach 1:
The patent extracts and eliminates the problematic temperature measurement component from the battery state detection process. Instead of using temperature information that introduces measurement errors, the invention relies solely on voltage and current measurements which provide accurate battery state detection without the reliability issues associated with temperature sensing.
Solution Approach 2:
The patent introduces an intermediary calculation approach using voltage and current measurements as mediators to determine battery state. Rather than directly measuring temperature, the system uses voltage and current as intermediate parameters that can be accurately measured and processed to derive battery capacity and state of charge information without the errors inherent in temperature measurement.
2Measurement precision
If battery capacity is corrected frequently to improve accuracy, then detection accuracy improves, but the system complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the detected battery capacity is continuously corrected based on the relationship between voltage, current, and capacity. The system uses the detected capacity information to adjust and refine capacity estimates, creating a self-correcting system that improves accuracy without requiring complex external correction mechanisms.
Solution Approach 2:
The battery state detection system performs self-correction using its own measurement data. The capacity correction is achieved through internal processing of voltage and current measurements, eliminating the need for external calibration equipment or complex correction algorithms that would increase system complexity.
3Adaptability or versatility
If battery state detection is performed out of predetermined conditions, then usage flexibility improves, but detection accuracy decreases
Solution Approach 1:
The patent implements a dynamic detection approach that adapts to different battery usage conditions in real-time. The system continuously monitors voltage and current and performs capacity detection regardless of whether predetermined conditions are met, adjusting the detection methodology dynamically to maintain accuracy across varying operational states and usage scenarios.
Data Source
AI summary
A semiconductor device generates battery state information including information of a capacity that can be extracted from a battery in the case of discharging from a full charge state until a discharge cutoff voltage at a predetermined discharge rate, based on measurement results of battery voltage, current, and temperature. The device calculates a first estimate value of capacity that can be extracted in the case of discharging the battery from the full charge state until the discharge cutoff voltage and calculates a second estimate value of capacity that can be extracted in the case of discharging the battery until a voltage larger than the discharge cutoff voltage. The device corrects the first estimate value based on a difference between a capacity value extracted from the battery by discharging the battery from the full charge state until the voltage larger than the discharge cutoff voltage and the second estimate value.